RE: range test with the kentucky 50 cal
You will never have good groups until you find out why your patches are shreadding...
What are you using for pathes?? How thick are they?? What are you using for lube and how are you applying???
Triple Seven doesn't do well with prb and patches, it burns hotter, that may be why your patches are burning through...
You'll have better luck with Pyrodex R-S, or better yet Goex in FFF or FF...