I'm working on dialing in some long range loads for a Montana Rifle Company 300 Win Mag. It's been a challenge to find the right combination for the loads, and one thing that seems really odd to me is the amount of freebore on this gun. The difference between having the bullet up against the rifling, and what will feed through the action is about 3/8". I've never worked with this much freebore before and am wondering if this might be the culprit for inconsistent velocities. Anyone have any experience or advice? Thanks, much appreciated!