I started out shooting the powerbelts, never lost a deer but I did'nt get the damage I wanted either. Swithed to the 240gr hornady sst's and they are some bad dudes, I even handloaded the sst's in my 260. I've probably killed 35 deer with my 45 and never lost a deer, only had 3 I can think of make it out of sight.
Bullets are getting harder to find, but there out there, BPS, Gander mountain, midsouth shooters supply, all carry the hornady 45's. Just do like I do, just clean of the shelves when you find some.