I am one of those guys that never cleans. The only time the bore sees a patch is if the gun has been out in the rain or snow. I have seen no perceptible change in group size or speed, over a weekend or over the life of the barrel, i see bigger changes switching lots of powders than from shot 200-1200. I Chronograph before every match and its always within about 10 FPS of what the load was before.
I feel that a stable bore condition is the key to consistency, and the easy way to achieve that is not cleaning. The current barrel is a 6CM is a currently 1900 rounds and has has spent its life shooting PRS and PRS style matches, at 3000 fps with Hornaday 109s. (H4350, and I don’t chase the lands.) its also almost done as its starting to slow down and throw some weird shots.
This works for me but al lot of shooting is mental and you have to do what makes you confident in your system.
