I have the opportunity to buy a fine used flintlock .45 cal rifle at a fair price. The seller thinks the rifling is 1/66. it is a lightly used Douglas barrel. This purchase for me would equal a fine custom made .45 cal flintlock rifle. I can use this for target use at the longrifle club I joined this past spring for their monthly woodswalk shoot. I am entertaining the thought of of squirrel to whitetail deer as well. What say you all on .45 cal round ball on deer? it is legal in my state but I have only used .50 and .54 cal round ball on deer to very effective results. What about squirrel? Any thoughts on 1/66 for .45 cal? Seems a bit slow of a twist to me for .45 cal.