I switched from Sierra GK's to Nosler AB's,& after running all the info I had through my Infinity program,I got a supprise.The calculated trajectory for my MV was off a lot at long range.The AB's POI was consistantly lower than the computer said.Like 5"-7" @ 500yds.I've tripple checked my velosity,& everything I can,but I'm stumped.Anybody have any ideas?