I agree about the .348 but I strongly suspect that I could find factory ammo for the 8x57 with fewer than a dozen phone calls. Now, for a hard to feed rifle, try a .318 Westley Richards! I had to have the dies made and the damned bullets cost over a buck a piece from Woodleigh. The only other brand I've seen offer them sent me two boxes that were enough oversize that I got blown primers! It makes fireforming no fun at all . . .