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Barrel Lapping vs. Tubbs Final Finish

 
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  #1  
Old 01-25-2006, 12:09 PM
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Barrel Lapping vs. Tubbs Final Finish

Just seeking opinions on how much of a difference there is between the two. I have read good things about the Tubbs system improving group size. I imagine it would be pointless to accurize a gun and pass on the barrel lapping because it was homemade.
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  #2  
Old 01-25-2006, 12:41 PM
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Re: Barrel Lapping vs. Tubbs Final Finish

A chambered and crowned barrel cannot be hand lapped without enlarging the diameter of the crown end which will destroy accuracy.

The best lappers with the barrel mftrs cannot do it, so no way an individual or local smith is going to be able to do it.

That is why all the mftrs AFTER lapping normally make a cut or mark on the end of the muzzle end of a new blank to tell you where to cut it off to get rid of that enlarged part.

Now Tubbs Final Finish works extremely well normally. However, I never fire all 10 of the shots with the largest grit normally. I normally fire 5 and then 5 of the subsequent sizes. After that I retest groups and cleaning. If I have to then I repeat, but never had to do it yet on at least half dozen guns.

BH
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Old 01-25-2006, 12:43 PM
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Re: Barrel Lapping vs. Tubbs Final Finish

I bought the NECO fire lapping kit, and used it on a Remington Sendero in .300 Win Mag that I used to own. It DID reduce my group sizes and more importantly, it made cleaning the barrel MUCH easier. I would recommend it for ANY non-Precision barrel. David Tubb's kit, if I'm not mistaken uses Neco's lapping compounds.
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Old 03-16-2012, 11:57 PM
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Re: Barrel Lapping vs. Tubbs Final Finish

[QUOTE=BountyHunter;96408]A chambered and crowned barrel cannot be hand lapped without enlarging the diameter of the crown end which will destroy accuracy.


I am a manufacturing engineer with experience with lapping. Any lapping operation uses a lead-in and an extension beyond what you are lapping so not to get distortion or enlarging. That's crazy to say that an inch or two has to be cut off the end of the barrel after lapping. Don't believe everything that you read on the internet! Hope this helps.
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Old 03-17-2012, 04:45 AM
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Re: Barrel Lapping vs. Tubbs Final Finish

I tried lapping a Rem 700 factory bbl with JB compound, and it did nothing. Just finished with Tubbs Final Finish. I followed instructions, did the entire treatment and now it cleans nicely, very smooth and no bluing, but accuracy has not changed at all.
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  #6  
Old 03-17-2012, 01:35 PM
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Re: Barrel Lapping vs. Tubbs Final Finish

Quote:
Originally Posted by Gene View Post
I tried lapping a Rem 700 factory bbl with JB compound, and it did nothing. Just finished with Tubbs Final Finish. I followed instructions, did the entire treatment and now it cleans nicely, very smooth and no bluing, but accuracy has not changed at all.
FYI,

JB was never designed to take the place of lapping. Polishing yes, lapping no. It may be considered a 'lapping compound' but it is too fine to cut and remove imperfections and smooth out tooling marks. Note that there is a big difference between smoothing out rough metal and polishing a metal surface. Hence the reason it did not work for your purposes. If anything, too much JB (even a little is too much IMHO) actually makes copper fouling worse due to the bore being too polished.

Another FYI. I have talked with several barrel makers and they all have said that a barrel can be lapped after it has been chambered and crowned. Their tecnique is different thats all. The only issue with the crown is that the very sharp edge/finish of the crown gets damaged. Freshing up the crown by a few thousandths of an inch cures that. New barrels get fish mouthed at the end from lapping because they don't care about the end of a barrel that is over 27" long that is to be finished at 26". They just lap them without regard for the muzzle end. It would take too much time on the production line to take that much care of a new barrel.
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Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
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  #7  
Old 03-17-2012, 02:30 PM
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Re: Barrel Lapping vs. Tubbs Final Finish

I have used the .30 cal kit on a rifle that I discovered had a .298 bore. It had visible reamer marks and it was a bear to clean. It would shoot sometimes down into the .3's but often with fliers shooting longer strings.
After following the instructions to the letter the velocity drop was 150fps with a known load.
Shooting 11- 3 shot groups with Berger 210's there was not one flier and most all were nice triangle shaped,the smallest being .122".
There was no measurable lengthening of the throat and cleaning is much easier.
I am quite satisfied with the outcome.
Cliff
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