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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Firer lapping vs. standard barrel break in?
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<blockquote data-quote="BountyHunter" data-source="post: 135356" data-attributes="member: 12"><p>Well I guess I will way in on this. Some good info and some out in left field.</p><p></p><p>Firelapping is not normally done for "break in" in the first place. </p><p></p><p>Each mftr of a custom barrel has different guidelines for breakin. Some say do it and some say do not worry. </p><p></p><p>Firelapping does not score the rifling, it polishes (ie thru the use of progressive finer grits) it by removing high spots and tool marks. that is like saying we finish the wood on a stock "scoring" it by using progressively finer grit sandpaper. Terrible sounding and totally inaccurate.</p><p></p><p>What do you think custom barrel makers use when "lapping' their barrels? Answer is abrasive grits. </p><p></p><p>I strongly agree/disgree with the statement not to firelap.</p><p></p><p>1. Agree to never ever firelap a CUSTOM barrel. </p><p></p><p>2. Disagree with not firelapping factory barrels. On factory barrels if you have bad coppering, I use only 5 bullets (instructions call for 10 of each grit) of the heavier grit to avoid pushing the throat too much and same even on the finer grits.</p><p></p><p>The last time I firelapped a factory barrel, my throat moved .010 only and it sure helped accuracy and cleaning. It would take hundreds of rounds down a barrel to remove the factory tool marks which would kill the throat first. So firelapping properly and sparingly done on a factory barrel is worth considering.</p><p></p><p>BH</p></blockquote><p></p>
[QUOTE="BountyHunter, post: 135356, member: 12"] Well I guess I will way in on this. Some good info and some out in left field. Firelapping is not normally done for "break in" in the first place. Each mftr of a custom barrel has different guidelines for breakin. Some say do it and some say do not worry. Firelapping does not score the rifling, it polishes (ie thru the use of progressive finer grits) it by removing high spots and tool marks. that is like saying we finish the wood on a stock "scoring" it by using progressively finer grit sandpaper. Terrible sounding and totally inaccurate. What do you think custom barrel makers use when "lapping' their barrels? Answer is abrasive grits. I strongly agree/disgree with the statement not to firelap. 1. Agree to never ever firelap a CUSTOM barrel. 2. Disagree with not firelapping factory barrels. On factory barrels if you have bad coppering, I use only 5 bullets (instructions call for 10 of each grit) of the heavier grit to avoid pushing the throat too much and same even on the finer grits. The last time I firelapped a factory barrel, my throat moved .010 only and it sure helped accuracy and cleaning. It would take hundreds of rounds down a barrel to remove the factory tool marks which would kill the throat first. So firelapping properly and sparingly done on a factory barrel is worth considering. BH [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Firer lapping vs. standard barrel break in?
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