Pick a bullet and range test it. If it doesn't group in your gun no use in pursuing. There are many good bullets out there and every single one will kill deer. Personally I hate the Powerbelts but there is a very loyal following that loves them. To each his own.
That said, I practice with 250 gr XTP in a red Crush Rib sabot from Harvester(cheap to shoot) and I hunt with a 300 gr Barnes Original or Barnes Expander MZ. Original for over 200 yards and Expander for anticipated close shots.