The bottom line here is that, ifyou wish to usereloads with a COL long enough to have the bullet close to the lands, then you have to use the rifle in single-shot mode (no feeding from the magazine).
That's why I don't like detachable magazines...restricts the COL too much. Got one in a Rem.7mm-08 700 Mountain Rifle and had a heck of a time getting accurate load worked up due to COL restriction with detachable magazine.