I got a Uberti 45-60 a couple of years ago, and have thinned the rim of 45-70 cases as well as making the base a little smaller, so the bolt will close. I did it exactly like you did, as 3.00 each for cases just because they have the correct headstamp is just a tad more than I can take. I have a nephew who's a machinist, and he sais he'd be willing to do the machining of a bunch of cases for me, so I'm going to take him up on it.