Mike,

They are in the little 375 Winchester, designed for the Big Bore Mdl 94 lever action. I think that using 348 Win case might make a nice round with some pop to it, using .375 bullets.

I'll check rim and base specs for the 375 Win and the 9,3x74r...this might be the way to go. I already have 12/9,3x74r and 0/u 9,3x74r barrels for the Valmet/Tikka receivers, but want to make up something in a .375 diameter. I'll be rechambering the 375 Win barrels.