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Fire Honing (bore polishing)

Posted on 08/18/2012 4:15:22 PM PDT by nomad

I`ve heard it refered to as "fire honing" or the process of polishing out minor bore imperfections thru the use of a fine grit dusted, low powered projectile, discharged thru the firearm. Does anyone have more info on this process and where one could find supplies?


TOPICS: Chit/Chat
KEYWORDS: banglist
I need to polish out some very minor bore imperfections in an otherwise excellent example of a 7.62x54R, Moisin Nagant.
1 posted on 08/18/2012 4:15:27 PM PDT by nomad
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To: nomad

Generally referred to as “Fire lapping” check out these people for a commercial setup:
http://www.neconos.com/details2.htm

I used their 22 cal kit for a pretty rough S&W Model 22A barrel that substantially improved accuracy.


2 posted on 08/18/2012 4:22:02 PM PDT by gunsmithkat (There is no such thing as Too Many Guns)
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To: nomad

Midway USA has bullets in various calibers that can be handloaded to polish the bore of a rifle or handgun barrel.


3 posted on 08/18/2012 5:47:19 PM PDT by 43north (BHO: 50% black, 50% white, 100% RED)
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To: nomad

Carburetor cleaner.


4 posted on 08/18/2012 6:01:25 PM PDT by mnehring
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To: nomad

I would not worry about any minor imperfections unless the gun is shooting poorly.

With these older mil surps it’s usually a better bet to rework the muzzle crown because the crown is usually worn out or damaged from improper or excessive wear caused by the cleaning rod during cleaning


5 posted on 08/18/2012 7:07:02 PM PDT by rdcbn
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To: gunsmithkat

David Tubb sells bore lapping kits. www.davidtubb.com


6 posted on 08/18/2012 7:16:18 PM PDT by schuetzen
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To: nomad

Midway USA sells the pre-loaded ammunition in several calibers. The .223 just happens to be backordered.

http://www.midwayusa.com/product/380492/tubb-final-finish-bore-lapping-ammunition-223-remington-box-of-20


7 posted on 08/18/2012 7:16:37 PM PDT by Patriot365
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To: gunsmithkat
Haven't used this system but I do have a rifle designed by David. Final Finish
8 posted on 08/18/2012 7:20:36 PM PDT by gantzm
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To: mnehring

Yup! Buy the cheap carb cleaner at WalMart works great.


9 posted on 08/18/2012 7:22:59 PM PDT by TaMoDee ( Lassez les bons temps rouler dans les 2012! Allez Pack!)
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To: nomad

Tubb final finish

http://www.davidtubb.com/final-finish-tms


10 posted on 08/18/2012 7:23:23 PM PDT by petro45acp ("Don't" read 'HOPE' by L Neil Smith and Aaron Zelman...it will bring tears to eyes. BORE!!!!!!!!!!!!)
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To: nomad

you don’t need ammo to lap a bore, you can do it by hand.


11 posted on 08/18/2012 7:24:30 PM PDT by calex59
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To: nomad

I am completely of a divided opinion as for the need for this (see rdcbn’s post). I ‘think’ I improved a Savage 110’s accuracy doing this, but I’m not certain. If I did, the difference was small and could be attributable to operator error/deviation.

Then, last September, at 168 yards (why the odd distance...max range on that particular lane), with a Model 70 in 30-06, I shot a 7/8” 3-shot group. That rifle has the most unholy looking bore I’ve ever scoped and I’ve owned it from new in ‘94.

Go figure.


12 posted on 08/18/2012 7:28:37 PM PDT by x1stcav (There's a bunch of us out here spoiling for a fight.)
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To: nomad

When I was building my last Savage 10, I followed the 50 round procedure Savage recommends for their barrels. I was more than happy with the outcome. It was kinda drawn out and took a while and several six packs and bore brushes to accomplish.

By the end of the break in, the barrel remains relatively clean and is very accurate for a suppressed 24”.

Not sure is this is what you are looking for, but the procedure is listed on the Savage website.


13 posted on 08/18/2012 7:42:37 PM PDT by eartick (Been to the line in the sand and liked it)
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To: calex59

How do you hand lap?


14 posted on 08/18/2012 8:02:57 PM PDT by nomad
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To: 300winmag; g'nad; Ramius

ping for further ruminations...


15 posted on 08/18/2012 9:01:02 PM PDT by osagebowman
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To: nomad

The older gunsmithing books will have a description of this. Basically, you need to either cast a lap in your bore over a pilot that screws into a cleaning rod, or you upset a piece of lead wire until you have to wedge it into the bore. Coat with a very fine lapping compound and start pulling it through the bore.

You need to pay special attention to getting the slug to exit the barrel cleanly at either end - and this is where the fire-lapping is better than hand-lapping on a barrel that’s already cut to size and chambered.

Most custom barrels that are hand-lapped are hand-lapped prior to being chambered and crowned. I lop off 1 to 1.5” of the barrel blank at the muzzle end to eliminate any “belling” from the lapping. The chamber reaming eliminates the other end’s belling, so that’s not cut back as far.


16 posted on 08/19/2012 7:24:30 AM PDT by NVDave
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To: nomad

Minor bore imperfections in a Moisin Nagant don’t matter, unless you have one of the sniper models.


17 posted on 08/19/2012 7:01:35 PM PDT by smokingfrog ( sleep with one eye open (<o> ---)
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To: smokingfrog
But I wanted a good platform to turn into a target-er. An aftermarket stock, crowning, and a scope mount. Its all in vain if the bore is not up to snuff. Took plenty of shows and LOTS of inspecting to find a jewel in the rough.Ever done a systematic check of the pickings of Nagants out there? NOT a pretty sight! Makes me cringe at what people are capable of doing to otherwise good instruments, course they did go thru a war, literally!
18 posted on 08/19/2012 7:37:11 PM PDT by nomad
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To: NVDave
But I was going to add an aftermarket stock and scope,remove the bayonet/sight lug section and crown. The chamber would be the only issue then. Can it be reamed a little?

How much is a new barrel or are they even sold?

19 posted on 08/19/2012 7:53:56 PM PDT by nomad
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To: nomad

Maybe a good cleaning would do the trick?

At any rate, you would want to make sure that any excess carbon or copper fouling is removed before fire lapping.

http://www.midwayusa.com/product/646612/wheeler-engineering-bore-lapping-kit

Found this interesting article about making your own electronic bore cleaner.

http://www.firearmstalk.com/forums/f18/making-electric-bore-cleaning-kit-31091/


20 posted on 08/19/2012 8:06:22 PM PDT by smokingfrog ( sleep with one eye open (<o> ---)
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To: nomad

New barrel already chambered, crowned and profiled for the rifle, or a new custom barrel which you can fit to your new stock?

New barrels are indeed sold. There are new barrel blanks, which have to be profiled by a gunsmith from a straight profile (about 1.250” in diameter from end to end) to your taper and length. There are custom barrels that come with a pre-set contour according to the barrel makers’ contour charts, etc.

How much are you looking to spend, if I might ask?


21 posted on 08/19/2012 10:40:55 PM PDT by NVDave
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