The humidity in SC is always high... if you leave any brand of powder in your muzzleloader an extended peroid of time it will through the shot off. I talking months here,,, I left a 100 grain 3f 777 load in my Omega a good part of deer season and then went on a hog hunt in late March... when I fired that shot at the hunting lodge it shot 8 inches high,,, the next fresh load shot where I shighted it in at, about an 1 1/2 high. The only complaint anyone could have with JSG is that it may be a few feet slower than 777, but a heck of alot cleaner!