Hey monkeys, a good question for you. My Brother just purchased a factory new Springfield M1a Scout, and is wondering how seasoning a barrel works. Now he cleaned it before he took it to the range the first time. He is using M- Pro-7 for copper remover and Hoppes 9 for the powder remover. Now after his 35th patch through with M-pro he is still getting green stuff out of it, and is wondering how much longer it will go on. His question is when is enough enough for the seasoning of a barrel? Should it come out clean with no copper residue or is the Cabellas recommended 20 passes for each round appropriate? Whats your say?