The cost of shooting an obscure gun....... First thing you will need a bag of 8mm lebel rifle brass or Winchester 348 brass ...60 bucks...then dies 40 bucks and then a custom bullet mold there there are no suitable bullets in production for these guns you will have to cast your own,... The problem is pistol bullets are not long enough or heavy enough. Because the ammo has to be a precise length so it will feed correctly and ride up the elevator to chamber... You can try to crimp the bullet heads at the very end of the case neck but a host of problems with ignition and loose bullet heads in the case neck occur,. This becomes very obvious once you try to reload the ammo with pistol bullets it will convert your vetterli into a single shot..mold 200 bucks,. You will also need a case trimmer capable of trimming a case with a very large Bass if you don't own one you can't make the brass hornady sells a nice one for about a hundred bucks., You will also need a way to Prime these because the base of the shell is so large many hand primer tool don't work Frankford Arsenal builds a nice one for about 80 bucks if you are not already casting your own bullets add the money for all that equipment. And don't forget you must convert it from Rimfire and Centerfire you can do this yourself with a little gun smithing skill if you lack this it's it's another 150.00 bucks... so .400 or 500 bucks and your ready to shoot 41 Swiss ... enjoy I do