Most importantly get a good bore guide and rod. I use a Tipton carbon fiber rod and a Dewey bore guide. I use a nylon brush and/or brass jag with 1" patches with Butch's bore shine. My .308 shoots better dirty for some reason so I clean after 200 rounds or so. I get .5" 5-shots groups but not until the bore is fouled with at least 20 rounds.
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