I am considering the 6.5x284, but like I said I've never had any expirience with it and when I started researching I found most guys were saying a 3" mag box was too short. As a matter of fact, my first call to Melvin on this rifle I was thinking it was going to be a 6.5x284, but then after further research I started thinking 7-08. So I figured I'd post on hear and hear from the guys who actually have, or have had a Nula in one or more of these chambering.