I just followed the Cooper's owners manual. It says every 5 rounds I did it after every 3 shots. Cleaned with copper remover (Montana copper remover), I also waited about 5 minutes between my 3 shot groups. it was about 50 degrees that day. The barrel stayed cool at all times. Cooper says...
Just purchased a Cooper Jackson Hunter in .270 win. Have only shot around 20 rounds thru it...bad weather here lately. So far it likes Nosler 140gr Ballistic Tips 3 shots @ 1/2" first two in same hole...I'm very happy with that. This is my first Cooper, so far so good. Had a .270win years...
I have only fired about 60 rounds through it. It was used when I bought it. I don't reload so 120 a-max and 129 sst are the only ones I've used. It liked the 129 sst Hornady. No... it is a 0 moa rail on it. I only shoot to @ 300-400 yards so that was all I needed. I'm selling it to fund a...