I got to shoot my new GM-IBS barrel this past Sat.
It's a .50 cal drop in for T/C Renegade.
I tried every powder I had with me, Pyrodex 2f, Goex 3f, and 777 2f.
Varied the charges from 50 to 90 gr.
.490 RB with .018 pillow tick patches lubed with mink tallow.
Accuracy was there, but VERY...