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Old 05-05-2021, 06:20 AM
la Fiere la Fiere is offline
Join Date: Oct 2009
Location: Northern California - SF peninsula
Posts: 2,074

Originally Posted by lapriester View Post
I have found that very often even once shot cases will have loose primer pockets.
This has been my experience using Federal brass for .300 Win Mag. Not knowing any better I used Federal brass for two long-range matches (80 rounds for record + sighters each). The first match I used new Federal brass, and afterwards all but a very few of the cases had oversize primer pockets (would easily accept my gauge). I had two blown primers (of 89 rounds fired) in that match (albeit with a fairly hot 220 SMK load). Similar results the second time.

I bought a couple hundred pieces of new PPU brass but haven't finished load development with those and can't say how they'll compare. Lapua brass is not available in .300 Win Mag.
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