Actually, the specs for the 7X57mm case head vary somewhat from the standard ".30/'06" (RCBS No. 3) dimensions. It seems to me that U.S. and Norma 7X57mm brass is made to the same specs as the .30/'06/.270 head, so this stuff fits into the No.3, but some others, mainly European, do not fit. I guess Sellier & Bellot 7X57mm brass falls into this category.

Sometimes excellent, sometimes needs more work, sometimes no good at all.



a) 7.62x25 S&B brass is stronger than Starline brass.

b) 7.62x54R S&B brass has the wrong radius at the bottom of the primer pocket and will not take American primers. I fixed this with a Lyman pocker uniformer, but now I use Lapua brass.

c) 12 ga S&B hulls have the wrong diameter and will not take American shotgun primers.

Yes, S&B brass is crap -I've never used ANY other brass that was as consistently poor in numerous ways. I'd throw it away and start fresh with some WW. I'd normally recommend Norma, but I've had quite a rash of problems with them lately including overly-deep primer pockets and split case necks.