What caliber are you shooting?
I've used a lot of 150gr GDs in my 300 HAM'R with very good success
this was listed at the video ending. 6.5 grendel, 18" barrel, 120 gr GD's, 2518 fps muzzle
edit: I may need to look at the GD's abit further. They shroomed out nicely. I did however expect these animals to drop like a rock.