Ok, I thought I was pretty knowledgeable but I stumped myself.
I just came into about a box and a half of Sellier Bellot paper 12 gauge shells. I dont think that they are particularly old, maybe 30 years.
They are marked 70 on the side which I know equals 2 3/4" and have a picture of a clay target on the black & red tube.
The primers are marked SBP with 3 stars, I dont know if they are boxer or berdan.
The base is marked SBP 12 with a logo and "made in Czechoslovakia.
They are roll crimped and the top wad is marked SBP 3mm. The SBP is the company, but what does 3mm equal? Is it shot size? If so what is that in terms of American sizes? Or is it some kind of dram equivalent?
