Just want to say thanks to
@Frank Green for the carbon ring removal and bore cleaning techniques. I didn’t know anything about carbon rings before joining this site, and had what felt like hundreds of bore cleaners lol.
Before, this R700 204 gun would throw some flyers and mess up a good group.
This 10rd group at 100yds is after using Frank’s blue JB paste cleaning method. Had to modify it a little for the little 20cal bore. Bug me for details if you want. Also bought a cheap borescope to verify the ring was gone.
Shot about 30 rounds after that cleaning, cleaned with Hoppes #9 as per Frank, and the below group includes the cold bore shot. This is with the semi-shitty factory Hornady Superperformance 40gr 204 ammo, with 130fps ES and 38 SD.
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The pdogs, they will be crying extra hard this summer. Thanks Frank!