.44-77 and paper patch?

[Kurt]

The only experiences I have had with GM barrels is their M/L barrels and several needed a lot of lapping before they shot. I know some shooters that use the GM barrel and they are shooting for them but again some dont.
I see where GM is honing the bores but I don't know if they air test them yet for bore consistency.
Jim I went through the deep groove once and I could never get it to shoot less than 8-10" at 200 no mater what powder/bullet or load I fed it. I called the barrel maker and he said sent it back and I will replace it or refund the money. I took the second barrel and it was off a little but it shoots quite well. I called the barrel maker if he still had the barrel I sent back and he said yes but like you said it's way off for .438/446. I asked if I could buy it to see if I can make it work and if not I will get it rebored for a .50-70. I said I will do some lap work on it to shallow up the grooves. We agreed on a price and I got it back. I turned some brass slugs 5" long and started lapping with 80 grid till the lap fell through and I increased the diameter and went back at it. This took most of the winter before I polished it with 600 grid clover and ended up with a over sized bore of .4393" but it started showing progress. The barrel ended up down the road and now is a .50. A .45 wouldn't clean the bore out.