I have a Marlin Guide in 444 Marlin. This Hornadyammo feeds fine and groups well out of this rparticular rifle. There was not as much less drop at 100 yards as I expected when compared to other quality ammo that is loaded with "flat nose" bullets and when compared to my hand loads. I use the Speer "Gold Dot" bullet. As far as killing performance, I have taken 3 white tail deer and one coyote with this rifle. Recovered the bullet from one of the deer. Mush room looks OK though it appeared that a lot of the lead had been lost in the wound path. All others were pass through with evidence of good expansion .. by the size of the exit wound. None of these went farther than about 30 yards after being hit.All shots were under 75 yards or so.