Yeah great advice, DEFINITELY try some round ball in it for sure. I forgot that you were shooting conicals. I have a Lyman Great Plains Rifle that will put balls in the same hole on the target, so thats what she is a round ball slinger and I wouldn't even think of trying anything else in it. And a round ball will put a deer down no problem, with anything else its all about shot placement, which goes back to finding out what that rifle likes. I commend you for wanting to hunt with a traditional weapon, and is what I'm into also. I think it will be a GREAT feeling when I take an animal with these traditional style rifles. Heck I've taken a great many deer in my time, so going to the woods with an inline or centerfire rifle is not that much of a challenge any more. Just my .02
"You're so drunk you cant hit nothin, In fact you're probably seeing double"...."I have TWO GUNS one for each of ya"