First off, I know very little about wildcatting cartriges and such, although I reload quite a bit. I really like my 9.3X62 and have noticed that there hasn't been a wildcat that gets a lot more velocity in 9.3 like those for the 375 (atleast one that I could find)I was wondering if a 9.3 Ruger based off the 375 Ruger would be possible. What about a 9.3 UltraMag off the 300 RUM? Please forgive my ignorance if I am missing something obvious. Does anyone have any thoughts about the viability of either of these combinations? Thanks in advance!

9.3 BS is the only way to go.

Of you wantum speed, I would got 9.3/375 Ruger.

BMT

Has anyone heard of a 9.3 Sisk? From what I could gather it is an 8mm necked up to 9.3 Might be just what I'm looking for....

I saw specs for a 9.3 RCM, which could be trick if you want a lot of thump in a short action. Would have slightly more capacity than a 9.3 Barsness-Sisk, which is on a necked-up .350 Remington Magnum case. I believe the 9.3 Sisk is based on a necked-up 8mm Remington Magnum case. You can go to Charlie's website and get the details on anything he builds.

If I wanted to hurt myself that way, I would build a 9.3-.375 Ruger. There would be no particular point to it, but then having a particular point of utility would not generally be the point of wildcatting anyway .

Dennis

The 9.3 BS and Sisk were made by or at least named for the custom rifle maker Charlie Sisk. The BS is IIRC an 8mm Mag case necked up the Sisk is the 350 Rem Mag case necked up.

The 375 Ruger case would do every thing the 8mm Mag case does. Or you could take the 416 Rigby case and make a shoulder mounted field piece. The Ruger case lets one use a larger variety of actions as it is 2.5 inches long.

Pick a case and build. Oh how we like to watch!

I want to make an 8mm with the 375 Ruger case just so I can call it the 8mmwapiti


8mmwapiti

8mmwapiti

9.3 Ruger...speedy.

9.3 RUM...ever speedy.

9.3 STW...ever speedy too.

9.3 Rigby...Wicked Speedy!

There is a 9.3 Rigby - the 366 DGW. It was developed by a gunsmith in Maine. I'd look at some of the standardized 9.3 cartridges:

9.3x64 Brenneke - Definitely is on par with the 375 H&H in terms of performance. Brass is scarce and pricey and it's got that funny rim dimension but a fantastic cartridge.

9.3x66 Sako (aka 370 Sako Mag.) - Reaches the lower end of 375 H&H performance. Standard (.30-06) rim dimension and is available in the U.S. now - Sako 85.

Nothing at all wrong with your idea and I do not see where the caliber has been beat to death by too many wildcats like we see in 25-30 cal's. I would Probably opt for the Ruger case and build it on a CRF winny.

I know the gunsmith who did the 9.3 based on the 416 Rigby. In fact, I have fired the rifle although it is ported so I cannot say what the recoil would be like without it.

FMI go to Cartridges of the World, 10th ED. and find it in the Wildcat section. Another poster on this forum once pointed out that 9.3 mm projectiles were not made to go that fast, but with premiums I suspect they hold up just fine. Our friend hunted the rifle on PG in 2001 with good results. I think his only complaint is the weight of the rifle he built is a bit too heavy but he can certainly discuss specifics with you if he sees this post.

stephenwhite,

I would tap into the European 9.3 cartridges before jumping into a wildcat; I am thinking the 9.3X64 would be a really good place to begin.

jim

.375 Ruger brass is a whole lot cheaper and more available than 9.3x64. One quick pass into the die and it's formed. And I'd bet that custom 9.3-.375 Ruger dies wouldn't cost a whole lot more, if any more, than 9,3x64 dies.

Yes it's a wildcat, but for practical purposes the 9,3x64 might as well be in this country. It's not like you can buy ammo over the counter anywhere.

Besides...he wants a wildcat... .

Dennis

If this is your first wildcats foray, consider something relatively simple ie. just a straight necking up. Now I'm more of a 35 cal guy then a 9.3 cal guy ... but the 300RUM case necked up kind of makes sense. Add one 320gr Woodleigh PP and 320gr FMJ and that's a whole lot of stomp! There's a few streamlined mid-weights now that make it useful when reaching out too. Use a cheap RemSPS in 300RUM as your donor action to get the modified magazine and rebarrel. A bit cheaper yet but less performance, find a S/H 300WinMag and consider something off the 300WinMag case. A 'smith with a decent reamer and neck/throat reamer selection could do your chambering without the expense of a specific custom reamer. Likewise an engineering shop should be able to open a set of dies for you to get you a 9.3RUM FL die and modify your seater for use to.

Oh ... and beware the lure of wildcats. They're addictive but 99% of the time, hardly worthwhile in a practical sense. But its a hell of a lot of FUN and will improve your skills as a reloader!
Cheers...
Con

Not as speedy as you want perhaps - but If you wanted a handier short action rifle - a 9.3 WSM would work well I think. I know of a few 375WSMs out there that were a great success.

I rechambered a 350 RemMag into a 350 WSM (35Sambar). It has been a success too and a sensible conversion. The ammo is easy-to-make too. It chronys 2750MV with 250s and 2450MV with 310 Woodleighs with top loads. A 9.3 WSM should be able squeeze out a little bit more power at the muzzle.

The Win70 WSM actions have the longest mag box length I believe of all the WSM chambered bolt guns. So that would make a good donor action I think.

Con's right - cats are fun!

Perfect example of why I enjoy this place. About the time I get an idea (considering a 9.3-375 Ruger) I find a two-year-old thread on the 'fire where it has already been discussed.

I mean, clearly the 9.3x62 isn't powerful enough, right?

I'm thinking of buying one of the many 9.3xSomething rifles that are around in Mauser actions and having it re-chambered into the 9.3-375. Should be an easy project as builds go.

Just go 370 Sako and have another round in the magazine.

Had that thought, too. Would be even easier & probably a hell of a lot more likely as little time as I have to tinker.

No brass to be found for the Sako. 375 Ruger is available & (presumably) just a simple full-length re-size before loading.

Sure there is.......

http://www.z-hat.com/9.3x66%20Sako.htm


I'm sure if a guy tried hard enough he could have 370 Magnum headstamped brass shipped from Canada or Europe

One of my hunting buddies of 30+ years had Bevan King barrel him up a 9.3 on the 300 Win Mag case this past summer. It is built on SAKO with one of Bevan's fine barrels, 26" long.

He was going to build a 9.3X64, but as muledeer mentioned above, it was no more expensive to do the wildcat, and 300 brass is everywhere. He has been mickey-mousing brass using a 338 Win die for the first step, and then 358 Norma mag sizing die with a 9.3 expander in it for the second.

CH is making a die set for him. They told him it is not the first set they have made for this wildcat, however it will still be six months delivery.

He gets way over 2800 fps with 286 gr Hornadys, and 2900 with Speer 270s using H4350 in the 26" barrel, and the rifle groups consistently around three inches at 200 meters.

He calls it his canoe gun! It will be interesting to see what it will do, once he gets a proper die set

Ted

At $2 per piece I could pay for a new 9.3 barrel for the 9.3-375 wildcat!

Now, the Canada thing might be a doable plan. I have a buddy up there who might be able to square me away. Still, Opening up the chamber on an existing 9.3 barrel would be easy with any of these options.

9.3WSSM...

Actually, that would be fun to have here in IN with some of the 232gr bullets they have. Heck, I'd bet it would push a 250gr AB fast enough to not bounce off a deer as far as I'd need to be shooting them. Hmmm....

Yep. I was thinking about Indiana when I made that comment. I know the .35WSSM was done specifically for Indiana, and the 9.3WSSM or a .375WSSM would fit that locale perfectly as well.

Just ran some fast QL calculations.

54.5 grains water capacity, 2.360" COAL, 1.660" case length, 9.3WSSM at 61kPSI, 20" barrel -

286 grain Hornady SP @ 2000-2100 fps
250 grain NBT @ 2200-2300 fps
232 grain Norma Vulcan/Oryx @ 2300-2400 fps
193 grain S-B SPFN @ 2600-2700 fps

That, would work.

Don't have access to my ballistic program right now, but would any of those stay above 1800fps at 400yds? IIRC, the 358 WSSM should with either the 225 PT/AB assuming I can get 358 Win speeds out of it. Since I plan on using a 26-28" barrel (thinking Encore at the moment), I could probably get to the top end of the speeds you listed plus maybe a skosh more. Interesting...

But, then again, the lighter options in 358 would be fun to try as well...

If you are running 26-28" barrels, you should be able to get around this:

286 grain Hornady SP @ 2100-2200 fps
270 grain Speer SP @ 2200-2300 fps
250 grain NBT @ 2200-2300 fps
232 grain Norma Vulcan/Oryx @ 2500-2600 fps
193 grain S-B SPFN @ 2800-2900 fps

The Norma 232s started at 2550 would be at about 1450 at 400.

The Nosler 250s at 2300 would be just under 1700 fps at 400.

The 270 grain Speer would be just over 1400 fps (started at 2200) at 400.

The Hornady 286 would be down to about 1500 started from 2200.

The FN 193s would be likely your worst choice for trying to stretch to 400.

Thanks!! May be more trouble than I need right now. If I can score some, the 180gr GS HV have a listed BC of .382 (IIRC). I'm guessing I could get them up towards 2800fps or more. That might be fun...

Personally, I'd neck it up to .375"...

That wouldn't suck either.

Hi,
I have been watching this thread for a while and just wanted to chime in. I come from a european hunting background and was missing something with a little more whumph than my 9.3x62. And as said elsewhere, 9.3x64 brass is hard to get as are controlled feed magnum actions. So a 9.3x375 Ruger makes sense. So with a reamer from PTG and dies from Hornady I went ahead. As guns are traditionally female I decided to call the Wildcat 9.3 Canadienne in homage to the Canadian girl that many of my german and american friend know best....
So a first gun was built with a Browning Abolt 3 and a McGowan Barrell, It took a while to get it to shoot as the stock and bedding in AB3s is [bleep]. Without pushing things to hard I get 2850 fps with 250 gr GMX and Woodleigh PP, and 2700 fps with 286 gr Hornady. And 3650 fps with 155 gr copper monolithitics. So after all that was done they nixed the grizzly hunt in BC......
The light monolithics make a fabulous open range load, with a 0 at 280y and 8in holdover at 400y. And then I shoot my first whitetail with it at 40 y........

Anyway, a second, nicer gun built on a FN-Mauser action is in the works and should be ready this spring. Happy to show pics if I can figure it out on this site.

Seems I heard of a .366 Alaskan some place. .338 Win Mag necked up if I remember right. Bet that would be right in the sweet spot for added horsepower.

Norman Strung IIRC.

AKA the 9.3 USA

sweat spot is in the eye ( or in the shoulder) of the shooter,

The 375 Ruger case has more volume, so for bullets with similar SD (210 gr in 338 vs 250 gr in 366 and 250gr in 338 and 286 gr in 366) the 9.3-375 takes 8-10 gr more powder ( I use H4350 and H100v in the 9.3 CAN.

Not sure how much velocity difference that would generate, I have not pressure tested my loads and stayed on the conservative side. but about 2900 fps for a 250 gr should be within limits, possibly 2950 . And the 338 gets 2700fps with a 250gr, so necked up a 250 gr bullet from that case could be a bit faster . A bit like the 280 REM vs the 30.06 where the difference in a 175 gr bullet makes barely 100-150 fps.
Hunting wise we'd probably be splitting hairs.
Just wanted to leave the note that a 9.3 from a 375 Ruger is an easy and well behaved wildcat, I think, if standardized it would be a tough competition for the favour of few remaining 9.3x64s fanatics out there.

Go find a Howa/Weatherby Vanguard chambered to .300 weatherby mag. Have the barrel rebored to .366 and simply neck down the .375 H&H or neck up the .340 Weatherby.....both will run through that action nicely and you'll have all the power you wanted.....further bullets of 200 grains are easily made by shortening the 250 grain Barnes.....I've done it and it's easy to do.....further, while spendy, at $2.00 each bullets of 200 and 210 grains are available as is. You should be able to launch one at 3,000 FPS or more if that trips your trigger.

When it's all done, you'll have a very special and powerful 9.3.....and yes....you still won't have a .375 H&H.....

No brainer 9.3x64. Next step the 375s, some really good ones but once you get above about 2500 fps with 286 to 300 gr. bullets recoil becomes significant. John Barseness wrote about a guy with a 9.3 x 8mm Sisk and the guy kept chanting what a big bad azz cartridge it was. He botched the shot on a Nilgai and JB pointed out it was a medium bore. Careful what you wish for. Ross Seyfried thrives on recoil but his 585 Nyati was just too much of a good thing. I believe he sold or converted the ones he had.



The H&H is so good in so many ways that it is difficult to improve or even equal it. The 9.3x62 has virtue by being lighter and having less recoil than the H&H but not quite it's equal.

The most practical 9.3 wildcat may be the 338 Win mag necked to 9.3. I have built several, folks who used them seemed to like them. I also built a 378 Wby necked down to 9.3. That thing was a hoss. Way too much for me.

I would agree, and again, splitting minimal ballistic hairs: I have loaded my 9.3 x375s to 2760 fps with 286 gr Nosler partitions, to 2880 fps with 250 gr Accubonds and similar with Woodleighs and to 3650 fps with some super light 155 gr monometals. that is still 50-100 fps below what I think could be achievable with the right powders, but accuracy is great, recoil is tolerable. A 9.3x338 mag would achieve the same numbers. Now if I could get my hands on some better brass than Hornady.......

Tejano,

While I realize your "recent" response on this thread is dated 3/31/18, you got the details of the incident with the 9.3 Sisk wrong. The guy did not botch the shot on a nilgai. Instead he shot a water buffalo in the right place, but the bullet failed, big time, breaking the shoulder but stopping in the ribs behind the shoulder. Most of the other bullets also failed to penetrate, before one finally made it through the ribs into chest.

As much as I love the 9,3x62 I would do a wildcat in 375. But if you must have a fast 9,3 how about the 9,3x70. It’s a Jeffery case.

Life would be easier if the 9,3x62 used a bullet just .009” larger.

https://www.gunbroker.com/item/785664523

Custom Ruger 77 MKII in wildcat 9.3/338 mag

No dog in the fight, my 9.3x62 does everything i ask of it, just saw the auction wanted to pass it along

Didn't Charlie Sisk have one that was either off the 8mm rem mag case or the RUM?