Home Forums Reloading Handgun Reloading Building 10mm Hardcast Loads

I've also been shooting the Rimrock 200 in a couple 10mm's. I was out yesterday as well, working with AA #9 and getting good results...

Bluedot, Longshot for the fast stuff. 231 for the target loads. #9 never clicked for me, nor did #7.

Will Longshot give me lower operating pressures over #9 with equal muzzle velocity with these 200 grain loads?

When I asked MBW about the difference between the coated and non-coated 200gr WFNs they said the coated ones are made with a more brittle alloy and are intended as a practice bullet, not a game bullet. They shoot the same in my guns, so it's a win.

In my G29, 8.2 grains of Longshot is very accurate and gets 1150 with the 200gr MBW WFN and the 200gr Swift A-Frame.

220 GR Rock River hard cast bullets, Blue Dot Powder,new Starline brass found an accurate load that shoots to the same point of impact as Buffalo Bear loads.

Buffalo Bore uses Rock River bullets if I recall. I use a heavier spring in a Glock 20 or a Springfield XDM , with 220 gr cast loads Buffalo Bore used to talk about how it changed the shot to shot velocity, helped a lot with accuracy.

Not much data out there for 220 gr cast loads in the 10 mm and factory loads are pushing the max so don't push it in an unsupported barrel.

Kurt, I believe the bullet you're using is a Rim Rock 220grain HC not Rock River. That's the bullet Buffalo Bore uses in it's loads. --- Mel
BTW
Has anyone checked the difference in penatrasion between the 200 and 220 grain hard cast. Phil maybe

Mel your right Rim Rock thanks, Kurt

Mel your right Rim Rock thanks, Kurt

Have any of you tried the 180 gr CKB bullets? I’ve got a fried that says that’s all he will use now in his 10mm

Agree on Blue Dot, I have a bunch of 215's loaded with it.

I tried Blue Dot and found it too flashy for my uses. Longshot has been great. Accurate powders are rarely available here, but No. 9 there’s consensus it’s a good option.

I’m also curious about how much more penetration a 220 will get you over a 200.

Accurate #9 has a nice controllable recoil impulse & low flash in full power 10mm 200 grain hardcast loads. Those attributes are important to me, haven't tried Longshot but some users reported sharp/snappy recoil characteristics.

I figured the 200 grainer would be a better compromise of velocity & peneration over the heavyweight 220 for my uses. Bought 200 of the Montana Bullet Works NOE version to experiment with.

41

You should like those.....my Kimber Camp Guard 10 does!


Frog---OUT!

Range report tried the MBW 200 WFNGC with Accurate #9 & a WLP primer in new Starline brass with the following loads.

11.3 grains
11.8 grains
12.0 grains

11.8 was the best of the 3 for accuracy and ran at 1140 fps out of my Glock 20 with the factory 4.6" barrel.

Was mildly surprised that I only picked up an average of 30 fps with the addition of .7 grains of powder

41

This is the same load I used for years but iirc I dropped to 8.2g Longshot with my 200 xtps for 1150 fps. I love Longshot in a 10mm and there's no better powder in a 40 s&w. However I've found my powder coated bullets I make seem to react a little to Longshot.

I put PC bullets I made in different little cups of powder for several months. Both Longshot and be-86 seemed to make the PC a little soft or mildly sticky over time. I'm not using checks so the pc bases would be exposed to the powder over time. I don't know if it would be a negative over the years but I've just been switching to other powders with my PC bullets.

Kind of sucks that 3 of my favorite powders seemed to react to powder coat. The third was tight group which I've used for years for my light loads. The vv powders didn't seem to react at all so I'm going to try some vv 3n38 next. I'd try n105 to but they discontinued it so I'm hoping 3n38 is good because it meters awesome too.

If vv doesn't work I'll try aa#9 next. I like the aa powders but haven't used #9 in a 10mm lately so I don't recall why I chose Longshot over it the last several years.

As far as the hottest 10mm loads go in my experiments 800x gave the best speed. I also really liked 800x with 240g xtps in a 44 mag but unfortunately I couldn't stand how poorly 800x metered. It's an incredible powder in every other way but I won't hand weigh pistol charges like I was willing to do as a broke student years ago buying 800x on clearance. I wish someone could make a new flash suppressed 800 x that metered well.

What size are you guys having your cast 200g bullets sized too? I have a 200g wfn M&P 6 cavity mold that just rains bullets once it's up to temp and I'm sizing .402 after pc. I made thousands of bullets last summer and powder coated them and I'm busy working up new loads now. I'm doing 44 mag right now then 45lc and then I'll do 10mm hopefully next week. I also have the m&p 180/190 mold with hp pins so I'll be loading some of those.

I'll be experimenting which alloy blends work with my 200 wfn this summer. I haven't gone with a super hard blend yet but made a bunch that should be about bhn16. I'd be willing to send some guys some of my 200s for free if they'll just report back how they worked. Maybe do some different penetration tests.

I could size them to .401, 402, or .403 and you could load them yourself. I've got 7 or 8 colors I can coat them with. I don't mind sending a few guys a small flat rate on me I'm not in the business I'd just do it for the shared knowledge of guys posting results on the fire.

Bb

I wouldn't mind trying some of those, I'm interested in that mold. Your pm box is full.

I've had good luck with Scot Royal 1500 powder, but that powder dried up in the '90's. I only have 1.5 pounds left. Longshot works great in my 45 Super, so it should do good in the 10 as well.

Frogman- where in WY are you?

PM sent



Frog---OUT!

Anybody ever try Pro Reach?? I have a pound of it and don't know what to do with it