I just went back out the the range to try my new chrono using the same loads i recently shot a little better than .75" with. 72.5 to 73 of IMR 4831 in 7 mm stw with 140 tsx. Except this time i could only manage 1.25". I went to cleaning and man after about 20 patches of sweets finally no blue. What is the best way to remove copper on the Barnes bullets and do you guys think that was probably my problem? Prir to sweets i had been using butches bore shine.