Hey guys I am new to the forum and also new to long range shooting. I am trying to work up a load for my new 7mm RM sendero. I am shooting 168 VLDs and am trying to find the best COAL by the method I saw on here and the one recommended by Berger where you load 24 cartridges, 6 at each of 4 different seating depths to find the best COAL. My question is how often should the barrel be cleaned during this testing process? Any info would be appreciated.