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  #1  
Old 05-25-2010, 07:11 PM
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8mmX338 Winchester magnum wildcat


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I inherited an 8mmX338 Winchester magnum from my father. I have dies and reloading data and a few rounds of brass. Can anyone tell me where to find brass for this caliber? I have searched the internet and to date not had any luck.
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  #2  
Old 05-25-2010, 07:13 PM
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Just make the cases. Start with either .300 Win Mag or .338 Win Mag.... the .338s are probably going to have the shoulder in the right place and be easier to form.

Good luck.
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  #3  
Old 05-25-2010, 07:37 PM
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OK so how does a relative novice go about making them?
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Old 05-25-2010, 07:55 PM
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Never mind my last my good friend came through with the answer for that one. Thanks!
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  #5  
Old 05-25-2010, 08:18 PM
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Quote:
Originally Posted by Joel T. View Post
OK so how does a relative novice go about making them?
If this is what I think it is, you have a full length magnum 8mm Remington case necked up to .338. Do you have just two dies, I suppose they are RCBS dies. Now what you do is but the 8mm Remington die and you should have a one stage die to neck it up to .338, as that is not much larger. The new case should be good as it is, and you can check it by running it through the full length sizing custom die.

Now to load; use a manual that covers the 8mm Remington magnum and look at the 225-grain bullet; this will give you the approximate loads to begin. You do not have to worry as long as you stick to maximum loads, not over, as the larger dimater bullet will be slightly less pressure. Get comfortable with this load, then if you want to try the 250-grain, you need to find loading data.

There is nothing new about this cartridge; men have been necking up the 8mm since it came available. I had this in both .338 and .308; Kenny Jarret made himself a name loading the 300 Jarret and he might have loading data for both.

If you are new to hand loading you should always find loading date as it take much experience to load cartridges based on your own understanding.

Did your father leave any spent cases? Most that hand load keep these and many for wildcats. Those you could just use his dies.

If this is not what I think it is, the full length magnum, then you need to look elsewhere; however, I never heard of anyone using the 8mm Remington magnum case shortened, as it would just be another 338 Winchester magnum.

The performance is close to a 340 Weatherby, but Weatherby has more free-bore and loads there ammunition hotter than recommended. It is a good heavy round that will drive a 250-grain bullet 2,850 fps, more than the 338 Winchester.

I had the wrong idea, but this cartridge is great! I wish Remington would have just went with the .338 to begin with, not that much competition with the 340 Weatherby, in my opinion.
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Last edited by Charshooter; 05-25-2010 at 09:15 PM.
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  #6  
Old 05-25-2010, 08:37 PM
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Hello Joel,
Years a go I rechamber a Brno ZG 47 from 8x57mm to 8x338win mag. I still use it and I like it a lot. I use the brass from 338 win.mag. to reload, ( you could use 7mm mag. but I do not like to stretch the neck to much.. .300 win mag work also if you do not care the long trimming..! )
If you choose 338 brass, one pass into the 8x338 full length die, trim to length, prime and load. I use mainly 200 grain tip nosler partition or speer spitzer for hunting over a healty load of IMR 4831 and mag. primer.
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  #7  
Old 05-25-2010, 08:48 PM
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If the die box is printed '8mmx338 Win Mag', you probably have a wildcat based off the 338 Win Mag case. If so, your dies should neck down 338 Win Mag cases to take the 0.323" bullet.

With wildcat cartridge naming not very clear sometimes, your wildcat could be based off of the 8mm Rem Mag case, in that case you would have to neck up to 338" bullet. Look at the stamp on the base of the pieces of brass that you have, and that will reveal the variety that you have.
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  #8  
Old 05-25-2010, 08:51 PM
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Charshooter,

I could be wrong, but I believe the OP has a wildcat based on the 338 Win Mag, necked down to 8mm, or .323" bullets. This would be the shorter (2.500") case, necked down, not the longer 8 Rem Mag, necked up. I'm sure both have been done, but it appears his is using the 338 WM as the parent case. If the cases are roughly 2.500" long, versus 2.850", then it's the 338WM, necked down.

QuickLoad shows a compressed load of IMR-4350 as being a good potential powder for this cartridge when used with both the 180 and 200gr bullet.
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  #9  
Old 05-25-2010, 09:03 PM
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[quote=Charshooter;508472]If this is what I think it is, you have a full length magnum 8mm Remington case necked up to .338......

I almost shure that Joel as a 8mmx57 rechambered to 8mmx.338winchester magnum. This wildcat was fashionable in the 60 and 70 when 8mm mauser rifle sold for around $ 50. The action is plenty strong and the magazine well tooke the 338 mag. cartridge length neck down to 8mm. without alteration, the only work required is cutting a new chamber, open up the bolt face and adjust the fedding ramp and you got yourself a rifle with plenty of punch for little money...nick name " poor man magnum " love this gun!
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Old 05-25-2010, 09:06 PM
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You are probably correct. I called the one I made an 8mm/338 magnum. I just don't see the logic in necking the 338 Winchester magnum down to 8mm, I did not even think of that. Maybe I called it a 338/8mm magnum, been so long I can't remember.
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Old 05-25-2010, 09:09 PM
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[quote=roberto mervici;508481]
Quote:
Originally Posted by Charshooter View Post
If this is what I think it is, you have a full length magnum 8mm Remington case necked up to .338......

I almost shure that Joel as a 8mmx57 rechambered to 8mmx.338winchester magnum. This wildcat was fashionable in the 60 and 70 when 8mm mauser rifle sold for around $ 50. The action is plenty strong and the magazine well tooke the 338 mag. cartridge length neck down to 8mm. without alteration, the only work required is cutting a new chamber, open up the bolt face and adjust the fedding ramp and you got yourself a rifle with plenty of punch for little money...nick name " poor man magnum " love this gun!
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I see, never thought about that, not ever bothering with military rifles. Totally ignorant about them, except the one Oswald used.

Oh, I did use some of the receivers
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Old 05-25-2010, 09:24 PM
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As I mention on #6 the best results on my rifle was with IMR 4831 and 200 gr. bullets, I also try IMR 4350 but prefer IMR 4831.
This is my pet load, if you try it, as safety measure start with 4-5% reduction and work it up.
Brass: WW .338 resized in to 8mm x.338win.mag. die and trim to length.
Powder: IMR 4831 71.0
Primer: CCI 250 and/or WW LRM
Bullet : Nosler Partition 200gr. and/or Speer Spitzer 200gr.
Cartridges O.A.L. 3.330"
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  #13  
Old 05-26-2010, 04:04 AM
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I hope we hear back from the OP, as this is an interesting cartridge and I'd like to know for sure what he's got, there. I've always felt the two most neglected calibers were 6.5 and 8mm. The 6.5's are getting plenty of love, these days, but the 8mm rounds still don't sell in the U.S., as evidenced by the failure of the 325WSM, which I felt was a very sensible and useful offering. It actually ties in with another thread on using more moderate velocity with bigger bullets.
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Old 05-26-2010, 04:32 AM
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Guys he solved the problem in post #4......
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  #15  
Old 05-26-2010, 10:17 AM
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Just make the cases. Start with either .300 Win Mag or .338 Win Mag.... the .338s are probably going to have the shoulder in the right place and be easier to form.

Good luck.

Mike, you have to be careful making them from the 300 Win Mag. I did some fo rmy .338 Win Mag, and the shoulder wrinkles pretty easily. Atleast it did for me. The easiest bet is buy 338 Win Mag brass, then you just neck it down.
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Last edited by Tang; 05-26-2010 at 10:32 AM.
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  #16  
Old 05-26-2010, 10:22 AM
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Mike, you have to be careful making them from the 300 Win Mag. I did some fo rmy .338 Win Mag, and the shoulder wrinkles pretty easily. Atleast it did for me. The easiest bet is buy 338 Win Mag brass, then the nexk just needs opened up.
To go from 338 to 8mm, you'd have to neck them down, but I'm pretty sure that's what you meant to say.
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Old 05-26-2010, 10:33 AM
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To go from 338 to 8mm, you'd have to neck them down, but I'm pretty sure that's what you meant to say.
Thank Jim, can't believe I screwed that sentence up so badly.
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  #18  
Old 07-15-2010, 05:51 AM
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I wonder how Joel T. made out....
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  #19  
Old 07-16-2010, 09:53 AM
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Tang, not involved but have helped with forming cases, a friend builds custom bull barrel 8mm/338 mag rifles, incredibly accuracy, but then everything he builds is like that, the 300 Win Mag shoulder is ahead of of the 8mm338 shoulder by .157 thousands, if 300 Win Mag cases are used I would suggest contacting Huntington for a forming die or cases.



http://www.huntingtons.com/dies_caseform.html



F. Guffey
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  #20  
Old 09-20-2010, 09:05 AM
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M 98 bugaboo with this round

Joel, I'm assuming that you do have the 2.5" PMM, or 8mm x 338 Win. Mag. wildcat. Mr. Layne Simpson tested an 8mm Mauser, Rem 700 Classic, in about 2004, and found that it got extra velocity with the same loads than his 8mm Mauser. In fact he figured that the Rem chamber equalled an extra 3" of Mauser barrel length, with it's military throating. I'm using 8mm Speer hot cores, at 200 grs., and still have problems with bullet jump. The M 98's magazine limits your ability to seat them out, far enough, to kiss the lands. This means you have unnecessary free bore. The new Speer Deep Curl 8mm bullets are supposed to solve this problem. My 8mm x 06, and Boer 8 wildcats, still exhibit bullet jump, which Layne's tested Rem 700 didn't have. You can seat smoked bullets out until you get contact, and then calculate things, but I'll bet you, they won't fit through your magazine box. I think it just goes against the grain of the reamer grinders, to do so short a throat, on a 8mm x 06, or a PMM reamer. Likewise, it goes against my grain, to load stumpy round nose bullets into a really long range rifle, just to minimise bullet jump. The same reamer print that was used for your dad's PMM, would make a killer wildcat in a long magazine P 14 Enfield, or Layne Simpson's tested REM 700 Classic, 8x57, if rechambered up to the PMM. I haven't had the chance to examine a new Deep Curl bullet, but it should solve this bugaboo, and have high ballistic coeffiicients to boot. Carpooler
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