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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel break-in
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<blockquote data-quote="Mikecr" data-source="post: 1269138" data-attributes="member: 1521"><p>Some paraphrased from a post at AccurateShooter.com:</p><p></p><p>A barrel will break in with any shooting -sooner or later. It's function is merely knocking down hi spots that strip copper from bullet jackets. These are from rough rifling and finishing of the barrel(chambering/crowning). Since break in is really no more than normal shooting/cleaning, it does not increase barrel life or anything like that.</p><p></p><p>The purpose of cleaning after every round or so is to prevent a build-up of copper that will be more difficult to remove had you shot 25 rounds on a Brand NEW barrel, before cleaning. It also serves to re-expose the surface you're hammering at.</p><p></p><p>Once the barrel is cleaning easy and copper fouling has dropped off to near nothing, that part of the break-in is done., could be a little or a lot, depending on barrel condition, and bullets.</p><p></p><p>What many see is an increase in velocity at the 50-100 round mark. When the velocities stabilize at the increased speed is when they do actual load development. Not a big deal as your brass needs to be fire formed before development anyway.</p><p>If you don't want to wait ~100 rounds, say for factory ammo use, go back to my earlier post.</p><p></p><p>And as far as firelapping, Tubb's TMS provides no worse than the same surface finish of the best in hand lapped barrels. This is why it's useful for the best in aftermarket barrels. JB Compound could be used here in lieu of firelapping if desired.</p><p>FinalFinish is a treatment system specifically for improving factory barrels that are button or hammered without followup lapping. I've never heard negative results from those that have used it for it's purpose.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1269138, member: 1521"] Some paraphrased from a post at AccurateShooter.com: A barrel will break in with any shooting -sooner or later. It's function is merely knocking down hi spots that strip copper from bullet jackets. These are from rough rifling and finishing of the barrel(chambering/crowning). Since break in is really no more than normal shooting/cleaning, it does not increase barrel life or anything like that. The purpose of cleaning after every round or so is to prevent a build-up of copper that will be more difficult to remove had you shot 25 rounds on a Brand NEW barrel, before cleaning. It also serves to re-expose the surface you're hammering at. Once the barrel is cleaning easy and copper fouling has dropped off to near nothing, that part of the break-in is done., could be a little or a lot, depending on barrel condition, and bullets. What many see is an increase in velocity at the 50-100 round mark. When the velocities stabilize at the increased speed is when they do actual load development. Not a big deal as your brass needs to be fire formed before development anyway. If you don't want to wait ~100 rounds, say for factory ammo use, go back to my earlier post. And as far as firelapping, Tubb's TMS provides no worse than the same surface finish of the best in hand lapped barrels. This is why it's useful for the best in aftermarket barrels. JB Compound could be used here in lieu of firelapping if desired. FinalFinish is a treatment system specifically for improving factory barrels that are button or hammered without followup lapping. I've never heard negative results from those that have used it for it's purpose. [/QUOTE]
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Barrel break-in
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