I looked at the nwtf message board and they seemed to be getting better patterns with a .670, so i tried my xxfull .670 mossberg choke and it performed a little better, 12 in the head, 4-5 kill shots. But for a $4 dollar shell i am just not impressed. In comparison I ran a .50 cent Remington Nitro through the same choke and it put 10 in the brain and spine.