I have had absolutely great luck with the flatbased HPs over the years, and don't think there is hardly any difference between them and BT designed bullets for varmints. In the off-season when my buddies and I are all loading up ammo for the upcoming hunts, we set out 20 ounce pop bottles out to 400 yards filled with water, and using a backpack as a rest we can explode them with 100% success at 300 yards and about 80% at 400 with our 243s and the Hornady HPs.