Went to the range with my buddy today. Got the deer rifles ready to go and broke out the AR's. He has a new build 1 in 7 twist rate. He was getting 10" groups all over the place with some old Wolf 55 grain ammo he had. Horrible. High one time, low the next group, all over the paper. I thought it was him so I shot it. Still horrible. Broke out some Hornady 62 grain (the heaviest bullet either of us had) and man what a difference. He was getting 1" groups with that. My Ruger MPR shot a couple of 7 round 1" groups with some American Eagle 55 grain, all at 100 meters. I got off without my own Hornady 62 grain and I really wanted to try some. With my 1 in 8 twist, they should shoot great. They really made a huge difference in his gun.