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Lapping barrel w/ JB

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24 December 2007, 01:31
chuckslayer
Lapping barrel w/ JB
Years ago before computors and internet, I cleaned my barrel with a stainless spiral bore brush.
I did not use it much.
But now that I am educated, I have the proper cleaning supplies.
After I clean my 30-06 barrel, it takes like 12 shots to fill the pores back in with copper, and then the gun is a tack driver.
How many strokes should I do with JB bore cleaner to some what smooth out the barrel.
30 December 2007, 02:13
pointblank
JB is non-abrasive and will not remove any steel from the barrel. Lapping compounds are used to lap barrels, but barrel lapping is an art form, and shouldn't be experimented with...unless you don't want that barrel to remain a tack driver.
30 December 2007, 02:24
wino
i usually go by feel more than counting strokes. use a patch on a cleaning jag, and stroke back and forth until bore feels uniform end to end. when you first start you should feel tite and loose spots. might have to play with patch thickness also to get the feel. i wouldn't worry about damaging the bore, like pointblank said, jb won't remove any metal. did my model 70 300 rum and probally took a thousand strokes more or less, but tightened up groups about a 1/8 inch.


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30 December 2007, 03:46
swheeler
A unique combination of ingredients and a one-of-kind, multi-step mixing process give J-B its special characteristics. They work together to cushion the abrasive action; the soft paste liquifies as you use it, then wipes out of the bore easily. The non-embedding feature means there’s no abrasive residue left behind which might keep "cutting" after you’ve finished cleaning.
It is a non-embedding abrasive cleaner and will get that last little bit of copper and powder fouling out, lead too. I have used it for years, but not on a jag, I use a worn bronze brush of the correct caliber, wrap a patch around it and coat it with JB's,clean until you are happy it won't hurt the barrel, works wonders in the throat area especially if you shoot moly..02
30 December 2007, 04:49
Gatogordo
You will wear out your arms LONG before you lap a barrel with JB.


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08 January 2008, 07:39
Fish30114
quote:
Originally posted by Gatogordo:
You will wear out your arms LONG before you lap a barrel with JB.


Believe that!!!

Look in Brownells for lapping compounds if that's what you really need to do, if you just want some really final cleaning, go the JB's.