I will begin with I did a search and did not find the info I was looking for. I am taking a Daniel Defense MK12 (I have had good luck with DD) and I am going to put a proof carbon fiber barre in for one of these calibers. I just cant decide between the 2 calibers!!!! I will not be reloading and the gun will be used for steel out to a grand and coyote maintenance all done on our farm. I usually run hornady ammo and that is part of my problem. I was hoping for feedback on factory ammo experiences with these calibers and feedback on proof barrels in these calibers. I could be talked out of Proof because I am looking for tiny groups. PIC below is rifle built with Proof barrel and it is a laser! Thanks Tom