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Long Range Hunting & Shooting
Barrel break in accuracy
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<blockquote data-quote="PNWdude67" data-source="post: 2468979" data-attributes="member: 110615"><p>Just shoot it, clean it at 50 rounds with boretech carbon remover nylon brush or scrub with patch til patches are clean and clean carbon from crown. Then shoot 200 rounds and repeat cleaning about every 200 rounds til the barrel is dead then chamber another barrel. We only shoot stainless barrels or CF wrapped stainless barrels. Have tried a few of the shoot clean repeat break in techniques, but the last 15-20 barrels just shoot about 50 rounds clean, shoot another 50 to get them up to speed and start looking at load data closer. Generally, they speed up about 100 rounds a little bit. When cleaned at 200-300 rounds they will sometimes shoot slow the first 3-4 rounds until fouled with carbon. Yes, we have measured all this with lab radar on enough barrels to see the pattern. I can usually get two barrels shooting drop data identical velocities and grouping well for the team matches we shoot with identical loads. Worst case has been a difference of .3 grains powder to match velocity and sometimes one barrel needs another .001-.002 shoulder bump to feed like butter. So with regard to barrel cleaning, IMHO most folks are over doing it with a regimented shoot/clean/shoot/clean break in procedures and frequent copper removal. Since abandoning that practice a few years ago, I have removed copper and cleaned more aggressively towards the end of barrel life to get another 200-400 rounds for training purpose only out of high round count barrels that start to slip. Doesn't always work. When the 5 shot ES and accuracy start to go again, I retire it. Our barrel life seems to be consistent with the average barrel life expectancy for the specific chambers cut in them.</p></blockquote><p></p>
[QUOTE="PNWdude67, post: 2468979, member: 110615"] Just shoot it, clean it at 50 rounds with boretech carbon remover nylon brush or scrub with patch til patches are clean and clean carbon from crown. Then shoot 200 rounds and repeat cleaning about every 200 rounds til the barrel is dead then chamber another barrel. We only shoot stainless barrels or CF wrapped stainless barrels. Have tried a few of the shoot clean repeat break in techniques, but the last 15-20 barrels just shoot about 50 rounds clean, shoot another 50 to get them up to speed and start looking at load data closer. Generally, they speed up about 100 rounds a little bit. When cleaned at 200-300 rounds they will sometimes shoot slow the first 3-4 rounds until fouled with carbon. Yes, we have measured all this with lab radar on enough barrels to see the pattern. I can usually get two barrels shooting drop data identical velocities and grouping well for the team matches we shoot with identical loads. Worst case has been a difference of .3 grains powder to match velocity and sometimes one barrel needs another .001-.002 shoulder bump to feed like butter. So with regard to barrel cleaning, IMHO most folks are over doing it with a regimented shoot/clean/shoot/clean break in procedures and frequent copper removal. Since abandoning that practice a few years ago, I have removed copper and cleaned more aggressively towards the end of barrel life to get another 200-400 rounds for training purpose only out of high round count barrels that start to slip. Doesn’t always work. When the 5 shot ES and accuracy start to go again, I retire it. Our barrel life seems to be consistent with the average barrel life expectancy for the specific chambers cut in them. [/QUOTE]
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Barrel break in accuracy
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