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Old 02-08-2013, 08:52 PM
Spawn78 Spawn78 is offline
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Default Triple Lapped Barrels

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Can someone point me in the right direction as too who makes triple lapped rifle barrels. I thought I had a deal with a gentlemen with a custom remington model 700 .308 with a us optics scope on it, but he decided to keep it. I'm wanting a custom Remington 700 action chambered in .308 with a McMillian stock. And a 20" triple lapped barrel with no optics.
Old 02-08-2013, 10:40 PM
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What does "triple lapped" mean? I have lapped many a barrel, and when done properly, it does not need to be done three times.
Old 02-09-2013, 09:34 AM
Spawn78 Spawn78 is offline
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Lapping before rifling is done to remove boring machining marks and makes for smooth lands with a consistent bore diameter. After rifling is complete, the grooves can then be lapped to smooth those out without making the bore any larger. This is done with a lead lap, cast into the bore. Since the lead shrinks upon freezing/cooling, it is a bit smaller than the bore/groove. The groove diameter of the lap is larger than the bore portion and by rolling the lap on a hard plate loaded with fine abrasive, only the groove diameter will be lapped. This must be carefully done to preserve groove diameter.

This is a double lapped barrel.

Finally, after the chamber and throat are cut, the leade can be lapped to remove tooling marks from the reamer.

That is a triple lapped barrel.
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Old 02-09-2013, 11:40 PM
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Hammer forged eliminates all that mess. But I digress. Why not consider a Llija, kreiger, lothar walther, etc. and not worry about how they arrive at the final product, as it is proven exemplary whatever the means.
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Old 02-10-2013, 12:23 AM
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