Got my load dialed in on my Traditions Kentucky rifle flintlock that I plan to use for deer hunting this season. A 50 grain charge of Goex FFG and a patched round ball shoots almost one hole groups at 25 and about 1 1/2" to 2" at 50. The groups begin to open up as I increase the charge. Is a 50 grain charge with a round ball enough for clean kills on a Midwestern whitetail given good shot placement ? Some guys in my circle keep telling me 70 grains is a minimum. Oh, shots will be no greater than 75 yards. -Thanks