I have a very much loved B&M 22-250 bullet seater. It came to me many moons ago minus the base.
Attachment 297743
Attachment 297744
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I use it on a piece of cold rolled steel plate that a friend ran an end mill down in for it to sit in and drilled a hole so the primer doesn’t sit on a hard surface.
I am guessing that the base would be the same for 308, 243, 30-06 and God knows how many more.
Does anyone have a B&M Seater for this case family with the original base they can take the dimensions from?
It would not be difficult to turn a proper base for it on the end of a piece of round bar stock… if I had a good photo of both sides and the dimensions.
I can’t tell you why it is important enough to me to bother making a matching base, it works real well in what I have. I think it has to do with keeping tools complete and intact.