trying to make some varmint bullets for my 270. What is the least amount of bullet you would have in the case? i seem to remember at least 2/3 the diameter, but couldn't find it anywhere in my books. also if this little amount is used, would it make sense to crimp? i'm using sierra 90gr. HP, which do not have a cannelure, but i've got a lee factory crimp die, which says it will make it's own groove. what are your opinions on doing this? not sure how much i like distorting a bullet, when the maker didn't design it that way.