I have a lot of S&B brass for my 7.62x54r. I like it. It's good brass. In my experience, the biggest difference is the factory primers are installed flush with the case head, not slightly inset like most other brass. So, the reinstalled primer will expected to be flush, not inset. The pockets are tight, I really have to reef on the handle, but in a few reloadings they are tolerable. After pressing the primer home, I run my thumb over it. Any significant protrusion is easily felt and I will give it another press to make sure it's set properly.
