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Paper patch bore lapping (Read 1358 times)

KFW Oldtimer Offline Posts: 555 Location: Powell Wy. Joined: Dec 18^th, 2016	Paper patch bore lapping Jul 16^th, 2022 at 11:07am	Print Post
	Has anyone applied a bit of 600 alum. oxide grit to outside of the paper wrap and fired the slug. I have a new .45 cal. GM barrel that could use a bit of bore polish. Thinking 1 or 2 rounds might slick throat area without making things worse? Have done the lead lap in the past on others, just don't want to jump into that process now kw


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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Paper patch bore lapping Reply #1 - Jul 17^th, 2022 at 7:17am	Print Post
	Coool. The hones for shotgun chambers are 800 or FINER. FWIW

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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craigster Oldtimer Offline Posts: 686 Location: lost coast CA Joined: Feb 20^th, 2011	Re: Paper patch bore lapping Reply #2 - Jul 17^th, 2022 at 11:47am	Print Post
	Paper patch the bullets with some 1000 grit wet or dry paper.


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KFW Oldtimer Offline Posts: 555 Location: Powell Wy. Joined: Dec 18^th, 2016	Re: Paper patch bore lapping Reply #3 - Jul 17^th, 2022 at 12:15pm	Print Post
	craigster wrote on Jul 17^th, 2022 at 11:47am: Paper patch the bullets with some 1000 grit wet or dry paper. That might be doable, and could be a big regret in results. Also wet/dry paper would too thick for 2 wraps. I need safe small baby steps. Maybe Flitz or Semi chrome wiped on a couple of patches would gently polish the throat, bore and groove. kw


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George Babits Frequent Elocutionist Offline Posts: 1102 Joined: Sep 27^th, 2012	Re: Paper patch bore lapping Reply #4 - Jul 17^th, 2022 at 12:56pm	Print Post
	I think any kind of "sand paper," even crocus cloth, would be too abrasive. Mamy years ago Bill Ballard in Billings told me an excellent way to polish a barrel was to use tracing paper; the kind used in drafting. I never tried it though. George


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rgchristensen Frequent Elocutionist Offline Posts: 1091 Joined: Jan 2^nd, 2014	Re: Paper patch bore lapping Reply #5 - Jul 17^th, 2022 at 3:05pm	Print Post
	Many papers are somewhat abrasive, and may contain clay of some sort of provide opacity. It's probably a good bet that any given paper will have some sort of grit in it. CHRIS


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singleshotsam Oldtimer Offline Posts: 559 Location: Silver City NM Joined: Jan 15^th, 2009	Re: Paper patch bore lapping Reply #6 - Jul 17^th, 2022 at 4:33pm	Print Post
	Verl Smith of Lead Bullet Technology sells a fire lapping kit that can be used with lead bullets or jacketed bullets. It comes with detailed instructions and I have had very good success using it on a 40-60 Maynard and 45-70 barrels that were rough and leading. After the fire lapping the leading disappeared and the rifles shoot quite well. I also used it on a new Green Mountain barrel in 45-90, the first 10 bullets down the barrel were treated with the fire lapping compound and there was a visual improvement of the finish of the bore when using my bore scope.


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KFW Oldtimer Offline Posts: 555 Location: Powell Wy. Joined: Dec 18^th, 2016	Re: Paper patch bore lapping Reply #7 - Jul 17^th, 2022 at 5:59pm	Print Post
	Lead Bullet Technology does sound the way to ultimately go. I am going shoot 5 wrapped bullets first that I wiped with Flitz and have a look with the camera, then go from there. This new Grn. Mtn. barrel has surprised me with the tooling marks and the fact that groove is .459. The GG loads lead like crazy, so this one my be PP only in the end. thanks kw


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craigster Oldtimer Offline Posts: 686 Location: lost coast CA Joined: Feb 20^th, 2011	Re: Paper patch bore lapping Reply #8 - Jul 17^th, 2022 at 8:00pm	Print Post
	NECO is another source for bore lapping/polishing supplies. (You need to *Login* or *Register* to view media files and links)


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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 11464 Location: Why, out West of course Joined: May 29^th, 2006	Re: Paper patch bore lapping Reply #9 - Jul 18^th, 2022 at 12:41am	Print Post
	rgchristensen wrote on Jul 17^th, 2022 at 3:05pm: Many papers are somewhat abrasive, and may contain clay of some sort of provide opacity. It's probably a good bet that any given paper will have some sort of grit in it. CHRIS Papers made from wood contain silica. Silica is abrasive. Go ahead, wear your barrel out.....

	A blind squirrel runs into a tree every once in a while.
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KFW Oldtimer Offline Posts: 555 Location: Powell Wy. Joined: Dec 18^th, 2016	Re: Paper patch bore lapping Reply #10 - Jul 18^th, 2022 at 8:39am	Print Post
	Papers made from wood contain silica. Silica is abrasive. Go ahead, wear your barrel out..... [/quote] Wow that is "pure" genius, thank you for offering nothing useful....again. kw


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MrTipUp Frequent Elocutionist Offline Quality is to a product what character is to a man Posts: 1308 Location: Indiana Joined: Feb 19^th, 2020	Re: Paper patch bore lapping Reply #11 - Jul 18^th, 2022 at 2:16pm	Print Post
	As I was taught, patching paper should be made from what is usually called "acid-free paper". At its most expensive it's made from cotton rag or other pulp comprised mostly of cellulose. But more commonly and cheaply available are versions made from wood pulp but with almost all it's acidic lignin and other contaminants chemically removed, and often with an added alkaline buffer to further prevent acid erosion of the paper. Bill Lawrence


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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 11464 Location: Why, out West of course Joined: May 29^th, 2006	Re: Paper patch bore lapping Reply #12 - Jul 18^th, 2022 at 3:53pm	Print Post
	KFW wrote on Jul 18^th, 2022 at 8:39am: Papers made from wood contain silica. Silica is abrasive. Go ahead, wear your barrel out..... Wow that is "pure" genius, thank you for offering nothing useful....again. kw [/quote] Yeah, like your thread is useful.....

	A blind squirrel runs into a tree every once in a while.
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tim_s Oldtimer Offline Posts: 815 Location: 13066 Joined: Oct 11^th, 2006	Re: Paper patch bore lapping Reply #13 - Jul 18^th, 2022 at 6:30pm	Print Post
	I would suspect a tight patch with J&B short stroaked in the throat should do the trick.

	“ I don’t have to be faster than the bear, I just have to be faster than you”
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oldman46 Senior Forum Member Offline Posts: 424 Joined: Sep 21^st, 2016	Re: Paper patch bore lapping Reply #14 - Jul 21^st, 2022 at 12:36am	Print Post
	One of the members of the cast bullets forum suggested that after lubing some cast bullets is to roll them in JB bore compound. And shooting them to lap a barrel. Suggested that one should load them up using a mild load. And cleaning between shots to eliminate any leading. Sadly he is not with us anymore. Frank


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