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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Copper Removal Technique: Break-in vs Complete Removal
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<blockquote data-quote="Greyfox" data-source="post: 839159" data-attributes="member: 10291"><p>In my experience the effect of break in is different, depending on the barrel. For the custom and high quality factory rifle like the Cooper, break in using shoot 1 clean for 10 shots, shoot 5, clean, etc. seems to take care of it in under 25 shots. Sometimes much less or not at all. For some factory barrels, it's much more, and cleaning is always a chore, even after break in. The indication for me on a broken in barrel is the ease copper and carbon removal which is noticeably different between the first shots taken, and the final result. Also, velocities/ES stabilize. Even with customs that are well broken in, it is rare to not see some copper removed when cleaning. Some believe this is just copper vapor residue. Having owned four rifles with R5 barrels, it seems that they break in fast, clean easy, and will shoot very large numbers of rounds without cleaning with no effect on accuracy. I believe this is why they are preferred by the military. I use them on my tactical/competition rifles where shooting volume is high. Also, just finished a 300WM LR hunting rifle that has an R5 barrel. It took less than 15 rounds to break it in. After loadwork, I have only shot 50 rounds without cleaning but accuracy and velocity were maintained. Cleaning was complete with a few runs of Boretech. It then takes 4 shots to re-establish the prior velocity, ES, and accuracy. This is what I look for in a broken in barrel on a hunting rifle.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 839159, member: 10291"] In my experience the effect of break in is different, depending on the barrel. For the custom and high quality factory rifle like the Cooper, break in using shoot 1 clean for 10 shots, shoot 5, clean, etc. seems to take care of it in under 25 shots. Sometimes much less or not at all. For some factory barrels, it's much more, and cleaning is always a chore, even after break in. The indication for me on a broken in barrel is the ease copper and carbon removal which is noticeably different between the first shots taken, and the final result. Also, velocities/ES stabilize. Even with customs that are well broken in, it is rare to not see some copper removed when cleaning. Some believe this is just copper vapor residue. Having owned four rifles with R5 barrels, it seems that they break in fast, clean easy, and will shoot very large numbers of rounds without cleaning with no effect on accuracy. I believe this is why they are preferred by the military. I use them on my tactical/competition rifles where shooting volume is high. Also, just finished a 300WM LR hunting rifle that has an R5 barrel. It took less than 15 rounds to break it in. After loadwork, I have only shot 50 rounds without cleaning but accuracy and velocity were maintained. Cleaning was complete with a few runs of Boretech. It then takes 4 shots to re-establish the prior velocity, ES, and accuracy. This is what I look for in a broken in barrel on a hunting rifle. [/QUOTE]
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Copper Removal Technique: Break-in vs Complete Removal
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