My Ruger 77 Mk II .223 likes the cheap winchester 45gr varmint ammo. The top right group I shot with this ammo in my Ruger. It is a three shot group at 100 yards, my third shot is in the same hole as my second shot on the botom. The bottom right group is with the same ammo and rifle but my brother shot this group. He was not expecting my trigger to be that light so his first shot was a little to the right.