I ordered a 460 Rowland Conversion barrel for my XDm (shipped the next day!).

Of course factory ammo is near impossible to find, so I am jumping right into hand loads.

This is a ported barrel for the 4.5 in version of the XDm. I plan to start with the factory spring at 18# and see how it goes, perhaps it will need the 24#?

What are some good starting loads?

I have the following powders on hand:
Unique
2400
Longshot

I have 230 gr. RN bullets.

Next question: Has anyone tried to trim 45 Win Mag brass to 460? 45WM: 1.198 460R: 0.957

I see that a conversion could also be made from 308...again anyone try and succeed with this?

Thanks...looking forward to experimenting.

I haven't started reloading for my Rowland yet, been using ammo from Buffalo Bore, and Georgia Arms. Probably get some new Starline Brass when I do reload for it, as my Springfield Mil Spec leaves what I assume is an extractor dent on some, but not all cases. With full power loads out of a 4.5 barrel, it will be an "eye-opener"! Pretty stout from a 5" 1911 (Clark) comped barrel, and VERY loud.

I'm trying Buffalo Bore 185gr JHP's at 1350 fps, 230gr JHP at 1350 fps, and 255gr Hard Cast at 1300 fps - also the 230gr JHP from Georgia Arms at 1300 fps. So far, accuracy has been good with all of these loads, and for what I expect to use the .460 Rowland for (hog hunting), I expect them all to do well. In an article on the .460 Rowland, John Taffin says that AA#7 is the best powder choice. I have seen loads with other powders, and may try Power pistol, Unique, or maybe Universal. I like H110 for full power .44 mags, but do not know if it would work in the Rowland. Bullets need to be of strong construction, many meant for the .45ACP will not work. I am hoping to get more used to the pistol with the factory ammo, then start working up hand loads. The Buffalo Bore stuff has been easy to get from Clarks Custom Guns - also Georgia Arms ammo, and Midway has run the Buffalo Bore .460 ammo on clearance a few times.

By the way, I'm using the 24# spring, Clark recommends to start with that one, go down to 20# , maybe. 18# might come back pretty brisk?

The REAL GUNS website lists load data for the .460 Rowland with Power Pistol, AA#7, Long Shot, and True Blue powders using bullets from Remington, Speer, and Hornady (XTP) in weights from 185 to 260gr. Max case length is given as .960", max COL as 1.275". Data was from a Kimber 1911 with a Clark barrel, Federal 150 primers.

I'm still looking for loads with Unique and Universal, but will probably load some rounds using Power Pistol soon.

Thanks for the replies. I am feeling like we are exploring a new frontier, even though this round has been out for a while.

It is very impractical to mail order ammo where I live, so I either have to win the lottery to find any at the shops or make my own. After reading one of your posts regarding bullet construction, I took a look at the 230 RN's that I have. They are .452 and have a speed limit (just made that up?) of 1250 fps. So, perhaps these aren't the best choice? I'll look into the others that you posted.

Since the following for the .460 is not large. Midway USA usually has brass for it. It won't show up by searching Brass. Type 460 Rowland in the search box.

Of the three powders you list. Longshot is by far the best. There are others that work.

Is it a Clark conversion?

1) Do not load max at first.

2) Heed the warning about bullet setback. Most important.

There is a lot more to loading for this cartridge. Learn all you can before you do it.

EFrench-

Search here on the fire for "460 Rowland project"

It will save some time.

The Rowland, like the .45ACP, uses bullets of .451". .452 is usually for .45LC. What Gibby said about loading with caution and bullet setback. Clark recommends that if a round is chambered, it should be fired, or discarded, because of possible bullet setback and high pressure. I think I am going to like the Rowland VERY much, and I think you will, also. It seems to have a lot of potential for those who need (or want!) that much power in a semi-auto handgun.

You will love the 460 for outdoor carry. There is no other way you can put that much power downrange in a "controllable" fashion. Easy to carry. XTP's for light bodied game. Hard cast for heavier bodied game. The 460 will turn XTP's inside out. They are built for the 45 ACP, but work great. 250gr .451 XTP's hold up well if you can fine them.

The main thing, like Mike said, load conservative. Back e'r down about 100-150 fps from the MAX loads. You and the gun will like it better. That is where the Wison Combat loads are at. Use new brass for the hot stuff. Used brass for the target loads. Longshot powder is linier on the pressure increase. Power Pistol works good for the reduced stuff. AA#7 is good if it is the new variation with new data. Stay away from Bluedot. It spikes when you least expect it, it works better in larger volume cases. 2400 works better in larger volume case than the 460 also. The Hodgdon's website has reel good info on loads. This is not a cartridge for beginners who "want the most" out of their loads. There is a couple of fellows here on the fire that have not chimed in yet that can help you also. Good Luck! That two "chambered" compensator is amazing!

I have experience in the 460 for the 1911 only. I wish I could help you more with the XDm setup. There are some tricks to help the gun's longevity. You can be the knowledgeable one on the XDm 460 after awhile. Take your time with this one.

Your advice to back down 100 tom150 fps is sound. Of course 150 fps less is 45 super territory. The 230 in the Rowland at 1300 fps backed down 150 fps is 1150. I am shooting 1130 fps in my 45 super. The bullets hold up better and penetrate better Also easier on the pistol without the need for a compensator.

jwp475-

I knew you would show up with the SUPER thing again! On the first page no less. We need to go shoot together!

Love ya!


P.S. 1450fps-150fps= 1300fps. All at 15-18kpsi at barrel/slide release. Plus full control and quicker follow up than 45+P loads. Looks cool too.

The load data that here does not show more than 1332 or so. And that is the ball park of the Buffalo Bore loads as well as others


http://www.realguns.com/loads/460Rowland.htm


Your peak pressure at 1450 fps is well above the 38,000 psi for the cartridge and is not a load that I want to be standing near when fired. Metal attitude gives no warning before it lets go.



38,000 psi is above the recommended pressure for the 45 Colt in a Ruger only recommended loads and not something that I want in a semi auto. You are living on the ragged edge with a 1450 fps load, enough 38,000 psi is more than I am willing to stand behind in a semi auto recoil activated lock up system. That pressure would not concern me in the auto mag.

From Hogdon's loading guide



Cartridge: 460 Rowland
Load Type: Pistol
Starting Loads
Maximum Loads

Bullet Weight (Gr.) Manufacturer Powder Bullet Diam. C.O.L. Grs. Vel. (ft/s) Pressure Grs. Vel. (ft/s) Pressure
185 GR. HDY JSWC Hodgdon Longshot .451" 1.240" 12.0 1413 34,700 CUP 13.5 1503 38,800 CUP
200 GR. SPR JHP Hodgdon Longshot .451" 1.225" 12.0 1372 34,300 CUP 13.8 1456 39,400 CUP
230 GR. HDY XTP Hodgdon Longshot .451" 1.270" 10.0 1207 32,200 CUP 12.0 1336 39,200 CUP

The Real Guns site does show loads up to and over 1500 fps with 185gr bullets, 1400 fps with 200gr, 1300 with 230gr, near 1200 with 260gr. Buffalo Bore claims 1300 with a 255 gr Hard Cast - and they are know for loading "stout". Personally, although I have fired the BB 255gr rounds in my pistol with no problems, when I "roll my own" I plan to back off some. With the Clark comp, as has been said before, recoil is not that bad - but the muzzle blast is ferocious.

Remember also that the .460 is chambered in some revolvers and at least one carbine.

The BB hard cast loads are not overestimate the 38,000 psi level. Hard cast has lees bore friction than a jacketed and can be pushed faster at equall pressure


The SAAMI pressure for the 44 mag is lower than the 44 mag

jwp475-

You are correct. I miss quoted the max fps for the 230 Jacketed.

My load I settled on is 10.6gr of longshot. About 1256 fps avg. in my gun. Roughly 34 to 35k psi. The comp lowers the pressures below 20k psi before barrel/slide release. That is the function of this well designed comp.

I do not approach 38k psi in my guns. But just for argument sake. A fully forged frame/slide on the 1911 can handle 38k easily. It has been tested far beyond that. 34k to 35k is personal limit in my guns. Of course all this is extrapolation. using Hodgdon's figures and other research by me. Look at the load development for the 9x23 WIN (46,000). I know .355 vs .451 and head thrust.

Bottom line I load conservative. But it is still a bad a$$ 1911 that has unbelievable recovery rate of fire. Look at the link to u tube on Clark custom's website. The girl shooting rapid fire at 41 Magnum power levels. Then go out and shoot one yourself. Bring your credit card and smart phone. because you will want to buy a conversion kit before you get back to the truck.

ONE MORE TIME> The 460 Roland was developed by some of the best hand gunners because there are too many drawbacks to the 45 SUPER! Do the research. I am tired.

If you want an easy to carry gun with 41 mag (4" bbl) power that can shoot 8 rounds with quick reload of another 7, then this is the gun. Look at the video.

This is the gun I carry on the farm with all those wild hogs.(Hard cast)

We have been through this argument before. Now nit pick on something I left out on this post. We can do 20 more pages if you want too. Like I said -I am tired.

Remember, I told you before. READ EVERY WORD.

The Super is not the best because you have one. I use the 460 because I did my research. AND I had a SUPER. Been there done that. No thanks.

I am afraid that I have to disagree. To think that I haven't done my home work is naive at best. There is absolutely no draw back to the 45 Super 28,000 psi is not a draw back. You are wise to load to in the 1200 fps range. The SAAMI MAAP pressure for the 44 mag has been dropped from near 40,000 psi to 36,000 psi for reason. I never said anything about it being the best because I have one, you made that condescending claim.

Your making me dizzy!

WOW!

Hmmm. The original post was a question about loading for .460 Rowland in a specific pistol. .45 Super is undoubtedly a fine cartridge, but it was not the subject of THIS post, nor was the .44 mag. Gibby seems excited about the Rowland for the same reasons I am, lets keep it at that? And try to answer the man's questions?

I am enjoying the debate and learning. I received some 45 Win Mag brass and trimmed it to 460 specs. I loaded some 230 Jacketed RN starting at 10.0 of longshot and increased in .1 gr increments to 10.4 at this point. I'll try those at the range and see how things shake out. I still have the 18# factory spring on board, but ordered a 20# and 22# to tune if necessary. I should be able to get to the range with this on Thursday (hopefully).

I also bought a box of Buffalo Bore 255 Hard Cast, but I am leery to light them off with the factory spring until the lighter loads prove worthy. I'll post the results when I can.

Thanks for the posts (even the debate!). I have been reloading for many years, but still have much to learn.

Mike-

On my last post, I had a long response to jwp475 typed out. Like I said I was tired. I deleted it.

It was about how when I was young and listened to old coots argue their points. I learned a lot from that. Same here.

jwp475 and I get in to this all the time. People do learn from our --- well, lets call it a debate.

I do like the 460 Rowland. It has it's niche. I have 32 1911's. 33 in a couple of months when my 3rd Wilson shows up. 9mm,38 Super,45ACP,10mm and 460's. Looking at the 9x23 Win now too.The 460 Rowland has it's place. It's not for every occasion though.

EFrench-

Keep in mind the case capacity difference when comparing data. Most data is with 460 cases not 45 WIN mag. Just a reminder. Use a chronograph for sure.

I have never had Buffalo Bore ammunition meet their own specs. Keep that in mind also. GOOD LUCK!

Springs. It takes experimentation like you are doing.

That is surprising about Buffalo Bore ammo in your pistols. My experience is there ammo usually exceeds claimed velocity in mine shot over an Ohler 35

I love it!

good morn'n jwp!

Morning. Just goes to show the difference in firearms.

I haven't checked all the Buffalo Bore Stuff I've shot - or Double Tap, either, but what I have checked was pretty "hot".

Enjoy a good conversation, and at least try to learn from it, also. Sometimes, though, it seems like talking to my wife. If I asked HER a question about the.460 Rowland, she'd likely give my an answer about tire life on a Toyota!

THIRTY-TWO 1911's! Gibby, you are my hero!

Thanks for the wisdom. I have been searching the world over trying to find comparative data regarding case diminsions on the 45WM and 460R. Some sources claim that hte 460R brass is thicker than 45ACP, others not. Certainly the outside diminsions are equal, except for the oal. Perhaps the web thickness is different as well to accomodate the mag primer, but even that has been debated.

When trimming, I did indeed notice that the pilot was slightly snugger than 45ACP, I haven't tried it on 460 (just found a box of BB ammo).

Can this be quantified?

Mike- The BB ammo is hot , but just not to spec. Same with DT. It does not matter. I buy very little factory ammo. Most of the factory ammo was for the 10mm. There for a while a few years back you could not find brass for the 10mm.

32 1911s. yea, when I was young, I shot rapid fire locally and then went to bulls eye shooting. I never sell any gun I buy. Had to rebuild a few. Some more than once. Been reloading since I was 14 years old.

Efrench- Try to find SAAMI Specs drawing on line for the 45 Win and 460. I wish I could give you a link but I am computer illiterate. That 45 Win probably will be thicker in all dimensions. Check Starline brass's web site out also. If my memory serves me, 45+P and 45 SUPER brass is heat treated and has a thicker base and web sections. 460 Brass the same with a different grain structure in the brass. Large pistol and Large pistol magnum primers are the same dimensionally. My suggestion EFrench is to forget about modifying the 45Win. Just keep it simple right now. Use 460 cases.

Triton Cartridge,that did all the pressure testing for the 45 Super went out of business. Hmmmmm! I think Starline brass says NEVER shoot 45 SUPER in a standard 45 auto.--That one is for you jwp45!!

Long live Johnny Rowland, Bill Wilson and Clark Custom!!!!!!!!!!

No need to post that for me I know which weapons can shoot 45 Super and which ones should not. Only about 7,000 psi difference in 45 ACP and 45 Super.


I do not believe that the Rowland is SAAMI spec'ed, I could be wrong. Not sure

http://www.lasc.us/SAAMIMaxPressure.htm


Handgun PSI Rifle PSI Rifle (Cont.) PSI
17 Rem - 52,000 CUP 22 Hornet - 25,000 CUP 30-30 Winchester - 42,000
22 RF Short -
21,000

222 Remington - 50,000 303 British - 49,000
22 RF Long & LR - 24,000 222 Rem Mag - 50,000 CUP 307 Win - 52,000 CUP
22WRF - 19,000 223 Remington - 55,000 300 Savage - 47,000
22WRM -
24,000

22-250 Remington - 65,000 308 Winchester - 62,000
25 Auto - 25,000 220 Swift - 54,000 CUP 32 Win Special
-

42,000
32 S&W Long - 15,000 223 WSSM - 65,000 32 Rem - 37,000 CUP
380 Auto - 21,500 243 Winchester - 60,000 32-20 - 16,000 CUP
9mm Luger - 35,000 6mm Remington - 65,000 32-40 - 30,000 CUP
9mm Luger +P - 38,500 6 mm BR-REM - 52,000 CUP 300 Rem. Short Ultra Mag - 65,000
38 S&W - 14,500 257 Roberts +P - 58,000 300 WSM - 65,000
38 Auto - 26,500 25-06 Remington - 63,000 30-06 Springfield - 60,000
38 Special - 17,000 260 Remington - 60,000 300 H & H No PSI Std.
38 Special +P - 18,500 6.5 x 55 Swede - 45,000 300 Win Magnum - 64,000
38 Super Auto +P - 36,500 6.5 x 284 - No PSI Std. 300 Weatherby Magnum - 65,000
357 Sig - 40,000 264 Win Magnum - 64,000 300 Rem. Ultra Magnum -
65,000

357 Magnum - 35,000 270 WSM - 65,000 8mm Mauser - 35,000
357 Remington Max - 40,000 270 Winchester - 65,000 8mm Rem. Magnum - 65,000
40 S&W - 35,000 7mm BR - 52,000 CUP 32 Win Special - 42,000
10mm Auto - 37,500 7 x 30 Waters - 45,000 338 Win Magnum - 64,000
41 AE - 35,000 7mm - 08 Remington - 61,000 348 Win - 40,000 CUP
41 Remington Mag - 35,000 284 Winchester - 56,000 338 Rem. Ultra Magnum - 65,000
44 Special - 15,500 7.62x39 - 45,000 338 Lapua - No PSI Std.
44 Remington Mag - 36,000 7mm Mauser - 51,000 375 H & H - 62,000
45 Auto - 21,000 7mm WSM - 65,000 38-40 Win - 14,000 CUP
45 Auto + P - 23,000 280 Remington - 60,000 38-55 Win - 30,000 CUP
45 Long Colt - 14,000 7mm Remington Mag - 61,000 375 Rem. Ultra Magnum - 65,000
45 Win Mag - 40,000 7mm Weatherby Mag - 65,000 416 Rem. Magnum - 65,000
454 Casull - 65,000 7mm STW - 65,000 444 Marlin - 42,000
480 Ruger - 48,000 7mm Rem. Ultra Mag - 65,000 45-70 Government - 28,000
50 AE - 36,000 30 Carbine - 40,000 458 Win Mag - 53,000 CUP
7.62 x 39 - 45,000 470 NE - 35,000 CUP

You need to get the full pdf of SAAMI specs. It' on my desktop, has been for a long time. It's 170 Pages long. Unlike your list it shows the 45 SUPER and 460 Rowland.

Like I said-45 SUPER been there, done that, like most that are enjoying their 460 Rowlands. That is what this thread is all about.

I am glad you are putting so much in to this though.

The point of my post is that the 45 win is 40,000 psi

WOW! Shot the first batch of handloads and then the Chrono gave up... I used the 45 Win Mag brass trimmed to 0.955, 230 gr Jacketed RN (0.451) CC! 350 primer (Large Magnum Pistol), COAL 1.250. 10.0 gr. Longshot; 1157 fps (Clark chart says 1207 for 230 gr. XTP, so I believe this).

I used the factory XDm 18# spring and a ported conversion barrel for a 4.5" (5" length). While very snappy, it wasn't uncomfortable. The brass was ejected about 25 feet.

Since the Chrono gave out, I thought I would light off a couple of the BB rounds to see how they felt... I am thinking that a stronger recoil spring is in order. I didn't notice any slide lag, so I suspect that the spring is adequate, but a beefier spring may slow the slide a bit.

Overall I am pleased with the conversion barrel. It came with a +60% mag spring which should address some of the FTF issues (I didn't experience any).

Throwing brass 25' indications high slide velocity, a heavier spring is needed IMHO.

Agreed! 20# and 22# shipped today.

I have the 22# spring in my .460 1911, works fine for me.

I have a ?.Can you shoot 45 ACP in a 460 Rowland setup?

Ak Archer,

The 460 Rowland case is slightly longer... so No as both rounds headspace off of the case mouth. But you can go back and forth (acp/45 Super) with the 45 Super as they are both the same length, as long as your 45 is set up for the super.

Jerry

Right on ..... What do I need for a 45 super, a different spring?

Here is what is stated on 460Rowland.com: "Rowland Conversion will reliably feed and fire standard .45 ACP cartridges from standard .45 ACP magazines; just like the .357 Magnum feeds and fires the .38 Special� only bigger� much bigger. "

It is not wise however because the case is held in place by the extractor. while the recoil will be a fraction of what it would be with the 460 it is still a setup for malfunctions and perhaps a broken extractor or worse...

It take about 5 minutes to switch back to your original setup to shoot the 45acp. I would go that route. 5 minutes more to switch back to the 460.

I do not know the XDm that well. In a 1911, there are some simple tricks to slow the slide velocity down and hold the round in battery longer. If your are getting 25' ejection, you are tearing your gun up. Simple as that. I would call Clark Custom.

How are your fired cases looking?

One more thing, quit shooting your chronograph. Ha! Ha!

Johnny Rowland of 460Rowland.com came up with the idea for the cartridge, but the does things with it that Clark will not do as far as the pistols he sells barrels for and what shoots in what, and I personally think I'd take Clark's advice. This is a powerful cartridge, deserves respect and safe practices. I would listen to Clark - and others with experience with the round - and keep .45ACP ammo out of 460 Rowland chambers. Like Gibby said, you can switch back and forth between barrels - or just have two 1911's (my choice!).

Agreed. I have some heavier springs on the way to slow the slide. I have heard and read both ways on this, some are saying the stock spring is fine, others are upgrading. I will be upgrading.

My cases are looking fine. Of course you really cannot see pressure marks on straight cased brass very well until it is way too late. I was only hitting 1157 on the first batch of hand loads, so I am doubtful that it is overpressured.

I'm not supposed to shoot the Chrono? Maybe that is where I am going wrong! Actually, the sun was out and bright, so the diffusers were not doing their job too effectively. I got some readings on the first batch and then errors after that.



I did look at Clark. He is an advocate for 1911's only. There is definitely great information there, but not particularly applicable to poly frames. There is much to be said for a steel frame cannon. I don't own a 1911 yet, but am certain that there is one in my near future.

EFrench-

It is a learning curve of course. I wish I could help you more with the XDm. Sounds like your getting good case support with the barrel. Yea, when I want to shoot long range (with rifle) I have to place my crony in the sun sometimes. It is problematic.

Work with the heavier springs when you get them. Use the minimum spring rate that works. Too heavy and you run into other problems. Your mag spring should work, but the return slide battering can become a problem over time.

The most accurate chronograph readings come on over cast days, if sun is bright shade the chronograph. I learned this from Ken Ohler.

I have noticed that over the years. I have been known to use an umbrella on the critical ones. It always made a difference.

Interesting variables! I measured the spent BB brass and found it to be anywhere from 0.949-0.955. I played a bit on trimming today and was able to chamber a 0.961 45 Win Mag empty cartridge(maybe mroe?). This got me to thinking (scary). Straight cases headspace from the mouth, so it stands to reason that the cases are held in place by the ejector. However, when the cartridge discharges the case is forced rearward against the bolt, not forward against the ejector. So, perhaps issues with shorter cases are academic?

I found data indicating that the nominal OAL for the Rowland is 0.957 and another source that indicates 0.954-0.960.

On closer inspection of the BB brass and the reformed 45WinMag I did notice some marks on the rim from the ejector, I suppose. The marks are about 3/8" apart and the same on each piece of brass. Could this have been from the forces going into battery where the ejector stops the forward inertia and not on discharge? I could also see this happening if there was case pressure resisting ejection, however the marks are the same in my starting loads and the hot BB's.

So, this is a great learning opportunity for me. If my thinking is flawed, Heaven forbid!, please help me to gain a better understanding.

You mean Case length not Over All length (OAL)

SAAMI specs are .960 max. Trim to .950

Shrinkage is the norm in a correct chamber with short fat straight wall cases.

It' hard to say where the marks on the cases are coming from with out looking at them.

Any bulges (Glock Smiles) just in front on the groove? Caused by less support at the mouth of the chamber.

Is the primer indention round or slightly oblong? Causes by cases coming out of battery too soon.

You mean extractor, do you not?

Well, how did that get in there? Autocorrect! you gotta love it... thanks for pointing that out.

Gibby, thanks for the info. I will look at the primers.

Back to the range with some heavier springs. I tried a 20# and 22#. I also applied the heavier striker spring. I didn't notice any difference in the felt recoil or see any change in the function of the weapon, however I did have one failure to fire with a dimpled primer (I reloaded it and it discharged as expected).

I shot 230 gr. TMJ RN out of trimmed 45 WinMag brass, using CCI 350 magnum primers. Starting load was 10.0 grains of Longshot with 0.1 gr increments.

Weather was 30 deg F with about an 8-10 mph wind. (overcast).

I found about 50 fps difference between the 20# spring and the 22# spring (later was faster) on the same load.

I did notice some oval shapes on the primers with the 20# spring and the ejection was about 20'

22# spring showed round primer imprints and about 15-20 foot ejections.

Best load was 10.7 gr Longshot at 1249 fps. I did notice some primer flow at this load however.

Oval primer strikes is an indication of the slide unlocking prematurely as is the empties being thrown 20+ feet

I was very happy with the 22# spring. I demonstrated increased speed, better primer strikes and closer empties. I am wondering now if I should order a 24#?

Give it a try and see if it is better

EFrench-

You sure get parts quick up there. You overnighting everything?

You might try the 24#. I would not go any higher. 10.6gr or 10.7gr probably will be your sweet spot. Have you ordered any bullets for a Hard cast load?

Yes, it really isn't too bad since they retired the dog sleds. 3-4 days for USPS Priority. It really cracks me up that people still exclude Alaska from shipments when the flat-rate charges are the same and deliveries are relatively quick! Believe it or not, Alaska is part of the US!

After posting the info on the springs, I realized that Wolfe only offers the 22# for the XDm. The 24# reference is for 1911's. Are you aware of any other sources? I would be willing to give it a try.

I haven't delved into hard cast quite yet, but intend to. Of course the BB ammo is hard case, but really maybe too hot for the XDm? I did not fire any with the upgraded springs yet.

Bummer on not having a 24# spring option. I only use Wolf.

Is your extractor tuned? Meaning How does it eject 45ACP and 45ACP +P's? Did the stronger striker spring work.

On the 1911's,you can use a square bottom firing pin stop and stronger mainspring. It really does work in slowing the slide down and keeping the round in battery longer. VERY IMPORTANT!

Right now, if I were you I would keep the loads moderate in the XDm.

I have not shot any +p's, but the .45 ACP eject as expected about 10'. I agree with your suggestion and will keep around 1200 on the loads for now. Perhaps there is a better powder choice? I am not aware of the firing pin stop for the XDm, I'll look into that.

The stronger striker spring seemed to work well, however I had the aforementioned misfire with the stonger spring. So, I need to experiment a bit more with that.

Misfire with the stronger striker spring?

Can you get Power Pistol powder? It is the "new unique" for the higher pressure calibers. Titegroup is very forgiving. You might be on to something. Quicker peek pressures rates might be the answer. You will not get maximum velocities but it might be better for the XDm. Might surprise you in the short barrel also.

I like this thread. We are all learning here.

With the faster powders, might want to look at Hard cast.

I love learning!

Like everywhere else on the planet, powders are hard to find, so I take what I can get. I have seen Power Pistol on occasion, but not recently. Same with Tightgroup. I'll keep watching. I do have Unique, however I am a bit nervous to try that... I am using it for the .45 ACP 230 gr (same bullet)... so maybe....

I am not sure if you are asking about the mis fire or questioning if it happened with the stronger spring, so forgive the redundancy.... I was using the stronger striker spring supplied with the Wolfe kits and the round did not discharge. I cleared the round and inspected the primer and found a weak but very noticeable dent from the striker. I rechambered the round and it fired.

If Wolf shipped that spring with the recoil spring, I would use it. It might have to settle in and develop a "set" at first.

Rechambering rounds. Measure for bullet setback on your loads like we talked about before. Very important. New cases, bullet profile, ramp contour, expander plug diameter and crimp all make a difference. We are pushing the envelope with this load. A reduction in case volume from bullet setback would be bad. That is a another good reason to stay conservative in your loading.

Just subscribed to Ammoguide.com, and they have 3 pages with 55 loads for the .460 Rowland listed, as well as a lot of info on the cartridge including a detailed drawing with measurements (case length, diameter, etc). The loads are with Power Pistol, True Blue, AA-7, Longshot, and Blue Dot powders, various bullets from 165gr to 265gr. Velocities are from the 1100fps ranges to a max of 1543 with a 185gr Hornady.

Of the powders listed, the only one I have on hand is Power Pistol, but I like the looks of the loads for it. Most loads seem to use Federal 150 primers, but some use Winchester LP (which I have, and may use).

Weather here is getting better, so I hope to get mine sighted in with the factory ammo I have and then work on some loads, mostly at first with 200gr Hornady XTP's, as I have a bunch of those on hand. The listed loads for these with Power Pistol run to a max load getting 1472fps.

It must of been a good year for wild hogs around here. I am seeing a lot of sign in the last few weeks. I put the .460 Kit back in a Gold Cup Trophy last night. It took all of 4 minutes.

I will be packing it on the place in the upcoming months. Starting today.