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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
So...Breaking in New Barrel Is a Scam?
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<blockquote data-quote="Mikecr" data-source="post: 332498" data-attributes="member: 1521"><p>After cleaning it, you could have fixed your friends 375H&H through firelapping.</p><p></p><p>Automotive engine break-in amounts to tailor fitting imperfect parts TOGETHER, through rational controlled wear. Round piston rings to an oblong bore. With a little wear from both you get a perfect fit and extended life. Too much wear and life is greatly reduced as the rings will continue to turn. Same with lifters to the cam, and pretty much every other mating parts that aren't matched. With better parts, perfectly matched, you don't have to break-in, and still get the full minute of top-fuel dragster engine life!</p><p></p><p>But barrels don't wear from passing copper jacketed bullets, and every bullet goes down the bore a bit differently. So there is no correlation here with engine break-in. Breaking-in a barrel will not make it last longer, nor shorten it's life, as with an engine. It won't make the barrel shoot better either.</p><p>Lets just accept that barrel break-in doesn't happen at all.</p><p></p><p>Lapping is another matter. Barrels should be lapped, not just to smooth over machining(reducing copper fouling), but to ensure proper final dimensions needed for accuracy. </p><p>Unfortuantely, barrel makers have yet to determine and set dimensions(through lapping) to any standard. They do not even measure the bores they sell.</p><p>This is a huge contributor to the unpredictability in barrel performance that we have come to accept. It's why no brand is better than another..</p><p></p><p>Anyway, my lapping, or smoothing out the throating jaggies, amounts to 10 Tubbs firelapping rounds. I dress up the lands a bit every few hundred rounds with another.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 332498, member: 1521"] After cleaning it, you could have fixed your friends 375H&H through firelapping. Automotive engine break-in amounts to tailor fitting imperfect parts TOGETHER, through rational controlled wear. Round piston rings to an oblong bore. With a little wear from both you get a perfect fit and extended life. Too much wear and life is greatly reduced as the rings will continue to turn. Same with lifters to the cam, and pretty much every other mating parts that aren't matched. With better parts, perfectly matched, you don't have to break-in, and still get the full minute of top-fuel dragster engine life! But barrels don't wear from passing copper jacketed bullets, and every bullet goes down the bore a bit differently. So there is no correlation here with engine break-in. Breaking-in a barrel will not make it last longer, nor shorten it's life, as with an engine. It won't make the barrel shoot better either. Lets just accept that barrel break-in doesn't happen at all. Lapping is another matter. Barrels should be lapped, not just to smooth over machining(reducing copper fouling), but to ensure proper final dimensions needed for accuracy. Unfortuantely, barrel makers have yet to determine and set dimensions(through lapping) to any standard. They do not even measure the bores they sell. This is a huge contributor to the unpredictability in barrel performance that we have come to accept. It's why no brand is better than another.. Anyway, my lapping, or smoothing out the throating jaggies, amounts to 10 Tubbs firelapping rounds. I dress up the lands a bit every few hundred rounds with another. [/QUOTE]
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So...Breaking in New Barrel Is a Scam?
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