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Sidelock
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Originally Posted By: ellenbr
You know, I don't think you have the 8X57IR but the 8X57R/360, which I'm currently loading.

Cheers,

Raimey
rse


Uhoh. That's going to be really difficult to find brass for, isn't it? How do you tell the difference from the markings in the pictures, just out of curiosity? I'm having difficulty finding information on this gun.

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Well, I've just been down the path you are on if indeed you are a custodian of a dreiling chambered in 8X57R/360. Actually, if you use the lengthy version of 38-55(I think Starline has them for say 16 cents?) easy to convert but are just a few mm short & you just have to extend the bullet out. Other than that you need some 360 2 1/4" brass, but those are typically converted from something.

Cheers,

Raimey
rse

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Sidelock
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I'll keep my fingers crossed that it's 8x57JR then, hehe. I was thinking like the 8-88 marking indicated the Mauser case rather than the 360. Oops!

From the cartridge drawings, it looks like I can mic the rim recess once I have the gun in my possession, and figure out for sure based on that.

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Leave the chambers as is and get a case of 2.5" RST. How much do you plan on shooting this drilling with shotshells anyway. And the old wood will thank you also.


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I see a caliber marking on the rifle barrel of 7.7 mm / 57. This is a way to small a bore for the 8x57R/360 which is nominally a 9 -9.3 mm size, I forget its actual bullet size.

The military 8mm was nominally a 7.92 mm or .312" bore with grooves for either the .318 or .323S bullets. 7.7mm = .303" which likely simply the 8x57IR cut with deep grooves, not unusual on hunting rifles.

As mentioned in another thread I have an 8x58R S&S with 172.28 gauge bores (.300"). Slugging its bore revealed a groove diameter of .321" while the bore itself measured just short of the next gauge step which would have been .310" or a 156.14 gauge.

I have a Miller & Val Greiss, Munchen hammer drilling chambered 16/16/9.3x72R. It was proofed 6 13 & is marked 8.8mm / 72. 8.8mm =.346".


Miller/TN
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Originally Posted By: 2-piper
I see a caliber marking on the rifle barrel of 7.7 mm / 57. This is a way to small a bore for the 8x57R/360 which is nominally a 9 -9.3 mm size, I forget its actual bullet size.


9 - 9.3mm on a 8X57R/360? Many are in the 0.318" realm. 7,7 would have been the bore and increase to 8,1 with the rifling.


Cheers,

Raimey
rse

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Raimey;
Sorry, I got confused there. I was thinking the 8x57R/.360 was the 8x57JR case necked up to hold the larger bullet. You are right it is actually the old 9.3x57R case necked down to hold the .318" bullet.
The 9.3x57 case is a straight taper case similar to our .38-55 case but longer. Necking it down the take the 8mm bullet gives it a slight bottleneck.


Miller/TN
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Sidelock
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I read somewhere that the 7.7 indicated the J-bore of .318, which along with the 8-88 (aka 8mm M/88?) marking and the 57 led me to assume an 8x57JR rimmed Mauser chambering.

But I reaaaaally don't know much. I sure hope it's not something that's too weird to find brass for. I passed over a lower-priced drilling in 8x72r Sauer, but that brass would have been easier to find than the 8x57/360. Doh.

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Originally Posted By: Recoil Rob
How much do you plan on shooting this drilling with shotshells anyway.


Honestly, probably more than the rifle. We shoot a good many clays, and my favorite hunting/eating is tree rats. Mmmmmmm, tree rats.

I don't think my Load-All will do 2.5" shells, but I may be able to modify it to do so by drilling a couple of new holes in the handle and repositioning it. Hmmmm.

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It is quite easy to convert a Lee load all to 2 1/2". I did one a number of years ago and eventually bought a Mec 600 and installed a 2 1/2" kit. I believe I gave the converted Lee to someone here at double gun.

I had a piece of 1/4x1 1/4 aluminum bar stock and placed it under the shell holders and shortened the crimp sleeve.


After the first shot the rest are just noise.
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