I'm still in the thought process as far as calibers. I would like a 405, but I'm also debating on the 9.3 x 74r. I still would like to find some 375 caliber that was "common". I looked at the 375 x 2-1/2" NE, but the money I saved on barrel blanks would be spent buying brass for god's sake I can't win!! All of this aside though, I haven't even had time to fully inspect my donor gun yet.