I use a lot of the S&B 9mm brass. Some of it I have reloaded over 15 times now and it seems to be performing just fine.
The only problems that I notice with it are: first, as stated above it does tend to have tight primer pockets, but I have not been able to seat primers so I don't worry about it. Second, it is a little heavier and softer that other brass. Becuase of this I use it for target loads but not for any serious shooting.
I would be very careful working up max loads with it unless you were using only S&B brass and then I would start at least 10% below max and work up. The extra thickness could cause excess chamber pressure sooner than other brass.
IMO it is best to work with a single brand of brass and preferably a single lot to work up max loads. This should keep everything consistent enough that no accidents occur.
Rusty
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