I have been using the 6.8 for about 8 years now, both ar -15 and bolt rifle. It has accounted for many hogs and deer with out issue, I have used on coyotes some too. I like the 90 gr sierra bullet and used it on the majority of animals killed with great success. I did try the federal fusion 115 gr in case I would ever need to pick up factory ammo, it was decently accurate. So one evening I was setting in the stand and a coyote presented himself 70 yrds out ,had my 20" bolt rifle loaded up with the federal fusion ammo. I shot the coyote and down it went leg sticking up and shaking and all. Then it got back on its feet ,shot again, down it goes, then again back up and moving. Makes it to the brush and I don't see him again, thinking he is dead behind the brush I go on about my hunt. After a short time I see the coyote moving in the brush, I ready myself for a head shot as he presents himself, take the shot that did the trick. Seemed that that bullet wasn't expanding as the entrance and exit wound were not visible until I skinned the coyote.
bw