Thats odd, I have used well over 10K of S&B small pistol primers, and never had an issue. Years ago I got them for some $18/1k at Cabela's, but these days are over now - probably would take them if I get them now for $40-50/1KWarning: Ill-timed, foolish rant!
I’ll start with my closing thought ... If Sellior & Bellot were the last primer manufacturer on the face of the earth & my supply of primers was exhausted, it would mark the end of reloading for me!
While I have never had one fail to detonate/ignite, they are the absolute worst fitting primers I have ever used ... irregardless of brass mfg. &/or primer size, seating S&B primers is a pain in the bum - and along those lines, they really should ditch the ampersand in S&B & replace it with a large ‘O’ .