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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Lapping vs. Tubbs Final Finish
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<blockquote data-quote="J E Custom" data-source="post: 1456444" data-attributes="member: 2736"><p>Sounds like I need to clarify what I said on my last post. </p><p></p><p>1= I don't consider any barrel that Is not accurate, still a barrel. it may have once been accurate but is just a pipe/tube once it looses its accuracy.</p><p></p><p>2=When barrels wear Out, They change dimensions in the lands, the bore and the throat. carbon builds up decreasing some dimensions and wear increases the dimensions. That's why we call it wear, Barrel material that was there in the beginning is no longer there. to be accurate these barrel dimensions have to be very close tolerance. once these tolerances are gone,some of the accuracy is lost. </p><p></p><p>3= The reason barrels that are lapped from the maker does not reduce barrel life Is because the barrel maker allows for the increase in barrel dimension from lapping by reaming the bore slightly small and Lapps to the correct barrel diameter (Normally this is less than .0001 to .0002 10 thousandths.He Lapps to a minimum barrel bore, when a barrel is lapped after it is delivered, It starts at the required dimension and these dimensions are increased.</p><p></p><p>4= Fire lapping DOES effect the throat area the most and the reason It would not be my choice for long term improvement. In many ways fire lapping is the quick and easy way to improve accuracy on rough barrel bores. A realy good barrel is dimensional'y consistent end to end and has a very good and even finish that minimizes fouling.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1456444, member: 2736"] Sounds like I need to clarify what I said on my last post. 1= I don't consider any barrel that Is not accurate, still a barrel. it may have once been accurate but is just a pipe/tube once it looses its accuracy. 2=When barrels wear Out, They change dimensions in the lands, the bore and the throat. carbon builds up decreasing some dimensions and wear increases the dimensions. That's why we call it wear, Barrel material that was there in the beginning is no longer there. to be accurate these barrel dimensions have to be very close tolerance. once these tolerances are gone,some of the accuracy is lost. 3= The reason barrels that are lapped from the maker does not reduce barrel life Is because the barrel maker allows for the increase in barrel dimension from lapping by reaming the bore slightly small and Lapps to the correct barrel diameter (Normally this is less than .0001 to .0002 10 thousandths.He Lapps to a minimum barrel bore, when a barrel is lapped after it is delivered, It starts at the required dimension and these dimensions are increased. 4= Fire lapping DOES effect the throat area the most and the reason It would not be my choice for long term improvement. In many ways fire lapping is the quick and easy way to improve accuracy on rough barrel bores. A realy good barrel is dimensional'y consistent end to end and has a very good and even finish that minimizes fouling. J E CUSTOM [/QUOTE]
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Barrel Lapping vs. Tubbs Final Finish
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