You can pick up MMP or Harvestor sabots (.45/.40) at Cabelas, or a lot of other shooting supply places. Get a 100 round box of 10mm 200 grain hornady XTP's from Midway shooting supplies or another place. Put the two together with 80 - 100 grains of 777 or Pyrodex, and you'll have a very effective deer combo out to 150+ yards. You'll also save a ton of $$$ compared to buying Powerbelts.

I've used this load/combo for the past 2 years - 2 deer, 2 boom-flops. Very happy with it.