once youve broken it in, ill bet youll need quite a bit bigger powder measure.. ill guess 100-125gr 2f for max accuracy.. my one in 66 square bottom .012 deep rifling 42 inch barrel .62 cal uses 100 gr 2f in summer, 115 in winter to achieve maximum accuracy at 50 yards.. .610 round ball, .020 patch and a little bag sized mallot to drive them in.. .. sure does womp them deer tho.. my son is starting to get spots for ME now.. he says his girlfriends dad will let me shoot a cow elk off thier haystack next fall.. well see.. first i have to get a tag, then he has to stay on good terms with the little lady, and her dad, and then the tough part, the elk have to cooperate.. according to him they are all over that hayfield every day.. her dad and her brother (12 years old) both shot big bulls last year.. same old story, family/owners gets the bulls, good freinds get the raghorns, down the line friends , get the cows, the rest keep out!!! i cant blame them.. several years ago one rancher had two of his ery expensive breeding bulls shot by someone, unhappy/frustrated with his luck, or just mean.. ... dave.....................ps for you beginning hunters, no, the elk dont stand on the haystack.. :rotf: