hey guys I just built a 300 blackout custom AR with a good 16" stainless Wilson match barrel. It is 1/8 twist. Something I think really weird is going on with it though. It shoots really good if you stick consistently to the same ammo...but if you switch its way off. The first ammo is the Remington UMC 115 grain. Second is Southwest ammunition Barnes hunting ammo...110 grain. I originally had it zeroed with the Remington ammo. Then I shot a couple Barnes through it and it impacted about 8 inches to the left. I didn't know why it was doing that. Then I zeroed it with the Barnes ammo and now the Remington impacts 8 inches to the right... strange huh? why do y'all think it has a huge difference windage wise? Ive never seen that before. Thanks.