A couple alterations to your ideas about the barrel. If it looks like you could stuff it all in a steel 55-gallon drum, it's a big one. If it's back is taller than the drum standing up it is a giant and you are not likely to see one that big. The real key is to shoot the bear you want and be happy with it. That may be the only bear that presents a good shot opportunity. Spring bear hunts in Saskatchewan with a good outfitter are as close as you can get to a slam dunk in bowhunting, but there are still plenty of things that can go wrong. Have fun and pick a nice bear to have on your wall. For some good reading material, check this out: Bear Baiter's Manual | Bow Hunting Road