Great for me at 60 yards is about 4-5" I do the same with field points, and with the rages, and with The Regular muzzies I abandoned.
I think It does have alot to do with if you shoot a thin wall or thick wall carbon shaft, or a thin diameter.
I have never had any problems with them.
I would never say I can shoot one hole groups that far away, my eyes just are not that good. lol