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Offline weemsf

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Lapping a bore
« on: September 05, 2007, 06:00:20 AM »
I have a T/C Contender barrel in 32 H&R that I believe needs to have the bore lapped.  I see a couple of rough spots in it.  Has anyone used the Tubbs' system?  SHould I just just the Wheeler Engineering compounds I have?  Any info or advice appreciated.
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Offline Hopalong7

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Re: Lapping a bore
« Reply #1 on: September 05, 2007, 09:32:49 AM »
A little JB Bore and a whole lot of elbow greese works for me.
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Offline Steve P

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Re: Lapping a bore
« Reply #2 on: September 05, 2007, 09:40:40 AM »
I agree with Hoppy.  My choice would be Flitz and a 32 caliber (.312 or .314) bore mop.  The mop will fit tighter in the barrel and will conform to the rifling better than a .308 mop.  Do some polishing and shoot a few rounds to see if the spot stays there.  I have lapped barrels, but it is usually a last resort.  I use unsized cast bullets with valve grinding grease in the lube groove and ground into the bore riding bands.  A primer and a couple grains of powder to get the bullet out the end of the barrel as slow as possible.

Good Luck,

Steve  :)
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Offline Grumulkin

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Re: Lapping a bore
« Reply #3 on: September 05, 2007, 11:35:59 PM »
If the "rough spots" are dirt, you don't need to lap the bore to get it out; soak the bore in Prolix.

If the "rough spots" are pitting or rust, lapping the bore isn't going to help.
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Offline skarke

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Re: Lapping a bore
« Reply #4 on: September 06, 2007, 05:14:23 PM »
Bore lapping is a bit of art, as well as mechanical ability.  Many folks think that just shooting a barrel will "lap" it sufficiently.  I have also talked with one guy at the range that actually hurt his accuracy and barrel life by using a rod technique.  Bottom line, make absolutely sure you need it, then go easy.  Don't overdo it.  JBs is great, flitz is a little more aggressive.  Last and for heaven's sake, use a good bore guide or you will trash your lands.

For what its worth, and have a great day.  :)
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Offline encore3006

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Re: Lapping a bore
« Reply #5 on: September 08, 2007, 11:48:10 AM »
Timely topic... I just test fired an older model 22 rim fire Mossberg that I treated with the David Tubb's Final Finish system and my group size was cut in half and the better rim fires are shooting better; i.e. Eley and CCI. Before I used the Tubb's system my group sizes were all the same...pitiful. I got a truer reading on which rim fires work best with my Mossberg...the Eley for Remington, CCI Match and Winchester Expert. I'll stick with the cheaper Winchester.

A friend used the Tubb's Finishing system, preloaded, on his 30-06 and 300 win mag. Today we tested fired his barrels after using the Tubb's system and he noticed an improvement...again a reduction of group size.

I spent the day with Tubb's bullets that I reloaded for my 7.5x55 Swiss Encore Barrel, 50 cartridges...I hope to see similar improvement.

I highly recommend JB paste and alot of elbow grease. I just believe the Tubb's system will complete the job that JB started in my other Encore barrels.

The JB paste route or the Tubb's syste will provide a barrel that not only shoots smaller groups but barrels that are easier to clean.

Just my "humble" opinion.

  8)
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