I have no experience with any new barrel break-in method. I just bought a new BAR .338 Win Mag and would appreciate some good advice on how to break in the new barrel for accuracy. Thanks for any response and advice you may give. PS: I ordered a Leupold illuminated MILdot 4.5-14X scope for it!! So, I am exited about the potential for this gun. My .30-06 BAR shoots under 1 inch groups with factory ammo, so I hope this new .338 will do as well or better!