I finally got out and shot yesterday, Set up at 25 yards, first shot low and to the right about 3" so I shot 3 more times. after the third shot had a nice clover lear group, the 4th shot same hole as first shot. So I made a sight adjustment and the next 2 shots were about an 1" left and just out of center.
Moved back to 50 yards 4 shots, made one more sight adjustment after the 2nd shot for elevation. That group at the end of 4 shots measured 3".
I then moved back to 75 yards. First shot a little low on the cardboard deer target and way left. so I made another adjustment. The next 2 shots right were they needed to be and measured 2". I did not use the rest and sand bags on the 75yard shooting. Just used me elbows as the support. I am quite pleased with how this GM 58 cal barrel shoots.

My rifle as stated before, TC Renegaded Hunter, 32" Green Mountain 58 Cal barrel, Green Mountain front sight that came with the barrel, TC hunter peep sight without the appurature.
My load that I was shooting; 100gr by volume Goex 2F black powder, Ox-Yoke pre lubed .015 patch, Hornady .570 round ball, Hot shot nipple, and #11 mag cap.

With this combo and my normal type shooting, the load went down the barrel with med pressure and smooth, and I cleaned after every second shot. I did take a third shot at the end without cleaning and it went down just as smooth as the first.

I did find one patch, not burnt through, a little tattered so the rifling must have a rough spot. I was a little surprised how good it looked as I figured I may need to use a .018 patch. Now to see if I can get some deer hunting in this year.