Originally Posted by
ubet
What do you guys do breaking in a new barrel, if anything?
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A lot of different theories. One that I read and follow is use the bullet heaviest bullet I can find for the first 100 rounds. As I understand the theory is that these have the longest bearing surface, which theoretically would polish/smooth more. Generally 75 or 77 grain.
I've tried 1 shot, cool, use Roger's Bore Solvent to clean, repeat times ten; then 5 shoots, cool, clean bore, repeat times four; then ten rounds SLOW, clean bore, repeat times four. Total 70 rounds and a long afternoon. Then clean after every range visit for a while,
I've also tried 5 rounds slow, cool, then clean repeat six time times; 10 rounds slow, cool, then clean, repeat times three time.
Then clean after every range visit for a while. Then clean the bore when accuracy begins to fall off - personally, I never get to that point, but I will fire several hundred rounds between cleanings.
To be honest, I'm not sure it helps much. The barrel will settle in as you shoot it anyways, just avoid rapid fire mag dumps early in it's life.
Here is a guy who probably knows what he is talking about: http://www.6mmbr.com/gailmcmbreakin.html
Last edited by 26 Inf; 06-10-18 at 00:05.
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