I use the 300 gr .429" XTPs with a Harvester green crush rib sabot with excellent accuracy. I havent killed a deer with them yet but I have shot my biggest bug ever (over 200 lb) with a .400" 200 gr XTP pushed by 80 gr of Pyrodex P. That bullet made a complete pass thru and left a devastating wound channel which was caused by good expansion shot at about 65-70 yds.