been thru this before but thought i would bring it up again to see what others are doing on this topic. just got my new 300wm and want to make it as accurate as possible so i plan to go thru the shoot and clean break in proceedure. what i have done in the past is one shot and clean with solvent and dry patches for the first 5 shots then clean after 3 shots for 2 or 3 groups and then after every 5 shots to complete the first box of ammo. then drop back to clean after each box. at this point i would be looking at removing any copper fouling. for this i have been use Bore Scrubber. let me know what you do if anything.