luv2safari
Why not the 444 Marlin case? They are probably stronger, and cheaper than 9,3 cases and you will not have to remove as much metal as with the 348 or 45/70. Check the specks for the 375 JDJ. The Hornady fourth edition has it under the pistol section. They get 2000fps with a 270 bullet in a 14 " bbl.