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Barrel break in

I don't think it matters on the shot routine, just don't let the barrel get real hot. I usually shoot a slow 5 shot group and clean. After about 50 rounds I will polish the barrel out with JB bore paste and then run a tight patch slowly down the barrel to feel any tool marks or burrs. I'm a firm believer that the JB polishing in the break in cycle will make a great shooter.Like this.
IMAGE_051-1.jpg
 
I've never followed any kind of break-in procedure and never had any problems. What is the reason for cleaning a new gun so many times the first 50 rounds or so? I've heard of it but never fully understood why.
 
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