RE: Better bullet
Well, Duck, what are you shooting? Ducks?? Bucks?? Bulls?? Bears?? The Partition Jacket will let you shoot just about anything, from coyotes to grizzly bears, but the BT's limit you to shooting more lightly constructed critters up to big mule deer. I would not choose the BT for elk, but it would do for them in .270 is you were using the 150 grain BT and limited yourself to broadside rib cage shots only!!
Keep yore powder dry!!