7.62 x 39 "rim flow?"

S

stagpanther

New member
New to reloading this cartridge since I recently bought a PSAK. I'm just getting around to sizing my once fired brass (lapua and PPU) and have noticed something fairly odd which I haven't encountered before: upon resizing the case will not fit in the wilson case gauge when it gets to the rim (these were mostly mild loads). Upon sanding down the rim circumfrence a bit the case will drop in fine.

Is this something common to AK's?
 
Yes, very common to semiautomatic rifles and seemingly especially more so for the AK and SKS platforms. See it a little with the M1 Garand as well, not so much with AR15 patterns. Generally no need to file/sand unless exceptionally bad, as they don't typically chamber that deeply in the actual rifle.
 
I've loaded for AR's for many years and never noticed this.

At first I thought maybe the primer pockets were getting over-pressured but the new primers went in tightly, although I did notice the edges of the rims were roughed up--I guess the whole cycle in an AK is rougher than in an AR
 
My MAC 90 beats the heck out of brass, kind of the main reason I put my AR 7.62x39 together. But, all my brass is once fired from AK's and once full length resized function flawlessly in my AR.
 
My MAC 90 beats the heck out of brass, kind of the main reason I put my AR 7.62x39 together. But, all my brass is once fired from AK's and once full length resized function flawlessly in my AR.
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Building AR's is "my thing" and like you this has come on my radar--I'm even considering making a piston AR for the first time.
 
I almost drove myself crazy trying to get my Garand brass to fit in a case gauge. After much fussin' and frettin' I discovered that upon ejection the case hit the OP Rod handle and was bent a few thousandths making the brass stand tall in the gauge. I put the case gauge up, somewhere, and just F/L size my Garand food, no chambering issues at all...
 
I have some 7.62x39mm brass so beat I can't count all the ejector marks on the rims, and they are still usable. Fired through vz-58 and CZ 527M. Sorry.
 
I have some 7.62x39mm brass so beat I can't count all the ejector marks on the rims, and they are still usable. Fired through vz-58 and CZ 527M. Sorry.
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I assume you reload--do you have any pet recipes?

For some unknown reason I'm finding that PPU brass outperforms lapua brass--which besides being far more expensive seems to have more problems with what appears to me to be a weaker case head.
 
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