J-B bore cleaning compound

Z

Z

New member
I have heard different theories on using this compound. Some people say that with badly fouled bores or to smooth out new bores it is great. I have used it a little, but awhile back a guy told me that he asked some long distance shooters about it and they wouldn't use it because it could damage your bore. What do you know about it? Thanks in advance.
 
I was told by a knowledgable salesperson @ Gander Mtn. not to use it a whole lot(whatever that means?). A gunsmith told me the same thing. Both of them recommended it though. Gregory
 
Knowledgeable salesperson at Garder Mtn.

That sounds like an oxymoron to me - at least it is in the gun department at the Gander Mtn. store near me. I've come to believe those dudes are all ex-shoe salesmen. /ubbthreads/images/graemlins/smile.gif /ubbthreads/images/graemlins/smile.gif - BCB
 
I have to agree with Bayou City Boy that a Knoledgeable salesperson at Gander Mtn in the firearms area is indeed a rare beast.

Seems like the ones they get that actually know something don't stick around, but the dumb ones stick around way too long.
 
Jb bore paste is a abrasive , There are barrel manufactures that the use of this product will void the warrranty . This product breaks the sharp edges of the rifleling and has an affect like accelerated wear, It will damage the throat and chamber . It it is not pushed all the way through the bore on each pass it will wear unevenly . The use of this should be limited to a last ditch effort , I have jar that is 7 years old and almost full.
 
I don't know, but can 9 out of 10 benchrest shooters be wrong? Off the top of my head I can only think of a couple that don't use JB's.
Thats why its called non embedding. The steal of the barrel is harder than the abrasive. It will cut copper and fowling but leave the barrel steal alone.

My 2 cents worth,
R Johnson
 
Calling JB an abrasive is a little misleading even if technically true. When we say abrasive we normally think of hard abrasives like lapping compounds. They are made with hard abrasives such as silicon carbide. Jb is made with a soft abrasive. It is softer than steel and will not cut the steel.

There may be some makers who will void a barrel warranty but I suspect they are just using JB as an excuse. Many of the best barrel makers like Krieger swear by JB.

Jack
 
A friend told me just today he mixes a touch of Kroil with some JB until it thins out the JB a bit in a small plastic cup. He then uses this mixture about every 5 cleanings he gives his rifles. I think I'll try the same.
 
My question would be.How could JB be any harder on the barrel than a bullet going down the barrel,dry, at 3500 fps time after time with a flame on its tail!!!! It is not valve grinding compound!!! I think your arm would wear out long before you could hurt your barrel with JB. Just my humble thoughts. Ter409 :rolleyes:
 
Great question Z. I've been told the same thing. "Don't use that stuff unless it's your last resort".

Thanks Jack and DAA. I have a jar too but use it sparingly. How often do you guys use it on your barrels?
 
I use JB's and it works great for me. I only run it down the barrel after every 250-300 shots. Or any time a buddy decides he wants me to make up some loads for his rifle. It has never failed me yet, and I do borescope my rifles with a digital borescope that we have in my jet engine shop.

BANDIT
 
I think when I ruin a barrel with it then I'll start to worry. I would rather wear a barrel out than my arm.
 
I am in the camp with Ter 409, you will probably need an elbow replacement before you do any damage with JB.

I use a borescope routinely and while JB does a good job of cleaning to the copper fouling so a copper solvent can dissolve it, it won't even begin to polish a barrel. If you want to try smoothing a rough barrel Flitz is a 100 times more agressive. And even Flitz is pretty mild.

mikegranger,
I use it anytime a barrel doesn't come clean real quick. A borescope takes the guesswork out of cleaning but lacking a borescope, I would use it if I did not get copper free patches after patching, waiting 10 minutes, patching again, for 1/2 hour with a good copper solvent.

Jack
 
I have used JB Compound for years, it has never caused me a barrel problem. I wrap a patch around a jag or smaller bore brush cover the patch with JB and add a dab of Kroil to the patch. The JB breaks down quickly so no worry about damage to the bore.

I start near the muzzle end and work back towards the breech using short strokes on the cleaning rod to pull any copper fouling out. Then I clean the bore throughly with Shooter Choice or Hoppes #9 and wash out all residue with gun scrubber. Dry patches thru the bore followed by a lightly oiled patch then one dry patch.
 
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