[golfcalc]

I have a question. I shoot two bullet weights from my .460 Weatherby Magnum. They are 500 g Hornady round nose at 2570 and 300 g Hornady hollow points at 3150. I don't use a muzzle break and both loads reproducibly shoot 1.5" 5 shot groups at 100 yards either leaning over the hood of the car with a 6" bipod or using a lead sled. Both impact at the same point horizontally, but the 500 g bullets hit 16" lower at 100 yards! Any explanations. I have shot them enough to know that these results are reproducible. Thanks for any ideas.