I load a lot of S&B cases in .38 Special and .45 acp. We have a Cabela's about 70 miles east of us, and it seems a lot of people by ammo when they shop there, since none of the local stores carry S&B.
It's usually the sharp edge on the primer pocket that gives people heartache when priming S&B cases on a press. I use the RCBS a Lyman Ram Prime units and this eliminates the problem. The key is to go gently when the primer is first entering the pocket, and then finish seating with normal force. I'm one of those people who happens to like snug primer pockets.
If you have a bunch of them, do as M1A4ME says and swage them. You can also lightly remove the sharp edge of the pocket with a chamfer tool. Neither is necessary with the Ram Prime, though.
Hope this helps.
Fred