White/copper-ish streaks or scratches in new barrel.

[Bidwell]

I disagree that lapping could cause a problem. It's really a low impact process. Most barrels are have a choke at the muzzle. Basically you take something like a jag on the end of a cleaning rod, run it up to the end of the barrel. Wrap the end of the rod with something to prevent the casting material (cerrosafe) to flow past. This cast will be your lap. Use very fine abrasive i.e. valve grinding compound to coat your lap. Run it threw your barrel as if you were cleaning it. Go slow and check your progress.
David Tubb developed a system of abrasive bullets to "fire" lap your barrel. I mean, Tubb should know what he's doing but, that process seems really high impact.

Abrasive bullets, interesting concept. I'll admit the idea of using abrasives makes me real nervous, but its worth more investigation

 

[Bidwell]

DO NOT lap you own barrel. if you are looking for a quality bore, buy a quality barrel that has already been lapped by the manufacturer. More times than not you will screw your barrel up by trying to lap it yourself.

Definitely appreciate the warning.

 

[ebb]

Lapping involves an abrasive compound, one of the barrel makers said he would have to watch a guy lap 100 to tell if he would ever be any good at it. But a very tight fitting patch on a parker hale jag with JB bore paste would most likely do the trick without enough abrasive to ruin anything. I have done this on some factory barrels and a few less known custom barrels and have only produced good results. Never a negative and only once no change. Some call JB an abrasive, I am not sure. But it works on stubborn carbon and less than perfect barrels in my experience.

 

[jackieschmidt]

Shooters were happy in their bliss before Bore Scopes became so plentiful.

Factory Barrels have always been, when compared to a true custom, pretty rough.

 

[jwv2001]

Shooters were happy in their bliss before Bore Scopes became so plentiful.

Factory Barrels have always been, when compared to a true custom, pretty rough.

Thanks, Jackie!!!! You made the point I was trying to make in a lot fewer words. BOGE at its best