Years ago I bought a fairly rough Mauser Bolo Broomhandle because I thought it looked cool. The bore is completely shot out and exterior retained less then 0% original finish and was pitted here and there. All the parts matched though, even the grips and while it would shoot, I had no idea where the bullets were going except down range. So, I took it all part and starting welding up some of the bad pits and adding metal where it had worn away, like at the muzzle and the grip frame where it had corroded away. I have cleaned up all the welds and bead blasted it and it is starting to look good. Next will be a rust blue and some new grips, perhaps made of bone. Originally my plan was to send out to have the barrel lined for .30 Mauser but sometime last year I read about the .22 TCM and wondered if that cartridge would work in the pistol but it was just a thought. Then comes the most recent issue of the American Rifleman with an article on the cartridge and guns for it which got me thinking again. The parent brass for the TCM is .223 which is also used to make .30 Mauser so it seems that it would fit just fine in the magazine and be able to be extracted just fine. I'm also thinking that if the cartridge is fine for use in a 1911 type pistol, it should be okay for the Mauser. Then I struggle with converting such a classic pistol to such a not so classic cartridge. Is it blasphemy? I may have a piece of .22cf barrel in my pile that I could make a liner with (also have .30cal barrels) and since the liners get glued in, it's not a permanent modification. So I think I'm talking myself into it. Does anybody here have any thoughts on why I shouldn't do this?