Hi Steve

I've been hunting with a George Gibbs two groove 20 bore for a few years,I have taken five bucks with it to date. My rifle has a rather slow twist,a little faster than 1/3 twist in a 30" barrel.Some things I have found with my rifle are,__ if the velocity is too low the belted ball goes unstable before a hundred yards but with the right charge an orange has no chance at the same distance. Felt wads between the powder and ball don't work in my rifle,it likes the patched ball on the powder. Round balls,(no belt) shoot okay,but with less powder or they strip. Mr. Gibbs made this rifle rather handy at 5 3/4 lbs.,it gets your attention when fired.