I have the Aribitor with tomb mount on my .300 win mag. I was shooting at a 1,000 yards the other day with my break banging steel and decided to put my Aribitor on it. I just kept banging steel at a 1,000 no problem. I never even checked zero at a 100 yards before I tried it at a 1,000. I'm assuming since I kept making hits at a 1,000 no point of impact shift what so ever. At least that was my experiance with my rifle. I use my Arbitor on my .300 blackout and 5.56 AR as well, so very versital can. I really liked my buddies SAS .338Vengence though on his .300, it was a bit quieter, just too big for the AR platforms. He had no impact change with the Vengence and Tomb mount either. Great setup.