Clean bore shooting

[ruchik]

I was watching the Magpul Precision Rifle video today, and came across the segment where Todd Hodnett discusses clean bore vs cold bore. He mentioned something I've never heard of before; that he never cleans the copper fouling out of his barrel. The reasoning was (as I understand it), that in the process of zeroing, the barrel begins to strip copper from the rounds. By the time the rifle is dialed in, the optic (or sights in this case) is set to POA=POI when the barrel has fouling in it. By cleaning out that copper, the gun will shoot off POA until the copper from the fired rounds has once again settled into the rifling and the barrel returns to the condition it was in when it was zeroed. Does the same apply to a Kahr barrel? I ask because in that segment, Hodnett mentions specific barrel manufacturers; Lothar Walther being one of them.

[jocko]

My bet it is geared towards rifle barrels. Just sayin

[olympicmotorcars]

When I first got my Glock and Kahr I tried copper solvents to clean the bores like my rifle but got almost no copper residue out of them. I think the polygonal rifling keeps them a lot cleaner than conventional rifling. Also, handguns bullets have a lot less speed than rifle bullets, this probably causes less copper to be left in the bore too.

Come to think of it does anyone know of any rifles with polygonal rifling ?

[TheTman]

I doubt at SD distances it would matter much anyway. If it's shooting a couple inches off at say 100 yards, that has to translate into only a few millimeters at 7 yards or less. (sorry, not up to doing the math this time of night) I wouldn't worry about it.