I've taken about 25-30 whitetails with Bt's out of my .280 Rem. with a handloaded velocity averaging about 2940 fps. The results have all been about the same: put the bullet in the ribs, you'll find the deer. That's from ranges of 30 yds. all the way to mylongest kill of 425. I did learn one thing however: if you're trying to knock a deer down with a BT bullet with a solid shoulder shot, you may have issues.. I haven't personally, but I've seen it happen to hunting buddies.