View Full Version : Reforming 7mm Mauser brass for the 7.65 Argentine
Passed the shooting test with flying colors.
It's easy to reform - one pass through the regular sizing die,
with not too much trimming needed.
Chambers easily. Bolt closes easily and shoots fine.
No pressure signs, no primer backing out, no cratering.
Hellava lot easier than reforming 30-06 brass !!
There is nothing wrong with reforming brass. I have done it with 30 BR brass to form 22 CHeetah, 223 brass to form 222 Rem and 243 to 22 CHeetah.
The 7MM case is perfect for the reforming to 7.65 Argentine as you found out.
The most important part of reforming brass to another caliber is keeping records, ammo cases clearly marked and that ammo separate from all others.
I hope you guys know that 7x57 cases have a shorter head-shoulder dimension than 7.65x53. Unless measures are taken to compensate, a 7.65 case made from 7x57 can give some .020"+ of excess cartridge end play when first fired. While this amount of slop usually won't result in an immediate separation, it can still shorten the case's life significantly.
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