Home Forums Hunting & Shooting Hunting Rifles Who uses JB Bore Paste and Kroil

Why, when and how often? Factory barrels only?

I have on occasion run a Kroil soaked patch thru the bore before and after JB swabbing. I tried mixing Kroil with JB Compound once didn't see much advantage to the practice, the mixture didn't store well.

I have a jar of JB Bore paste that sits on my bench. Only used it a few times for heavily fouled barrels. After bore is down to bare metal this stuff goes goes down the tube:



Midway Link

If you need to use JB often something is not right

I do.

I usually load 50 to 100 rounds per rifle per hunting season. I have six available for use during the season.

With each rifle I will start in September or October with a clean barrel, zero it, and put it up. Whatever gets fired during the season is all that is fired until post season, where I will fire the ammo for each rifle up, then get ready for next season by cleaning the barrel and start loading ammo.

Then I have two range-blasters, a Garand and an 03A3, they get kroiled each trip, but I'll usually run a hundred or so rounds through each when they go. Complete teardowns and cleanings about once a year.

ARs same-same except BCGs get cleaned each trip.

I've not used too much JB on my Garand or ARs.

I use to use Kroil & JB , since I found Wipe-out no need for it anymore. I recently acquired a bore scope and found a great use for it is to test cleaning methods. Wipe-out works great with almost no effort.
Kroil & JB works ok with much effort.
Keeping a cleaning rod out of the bore is enough reason alone to use the Wipe-out

Guilty!




FWIW,

this child don't do the standard barrel break in proceedure.






I typically will take a "new to me" rifle and set up on a rest and do 50 to 100 strokes through the barrel with a bronze bore brush coated with a JB/Kroil mixture, using a bore guide coated rod. After 20 strokes or so, I wipe the rod down and go back to swabbing. I usually change the brush after 50 or so strokes if I'm gonna do more.







I come back with cotton patches and only push from receiver to muzzle only. Don't pull the dirty patch back through the barrel. After patches are mostly clean i will check with wipe-out/patch out to determine if I'm down to bare metal. If so, then I run a couple kroil soaked patches and I'm good to go foul in the barrel










Can't prove that it works,



but what the hey!


After I hunt I may run a Kroil patch back through the barrel.

Figure it ought to be good for at least 60 rounds or whenever I notice accuracy falling off.



ya!


GWB

Nowadays, if routine cleaning with Butch's Bore Shine isn't enough, I do the J-B thing with KROIL to clean it up.
Have to shoot until accuracy returns, then go back to BBS. FWIW, I always oil a patch and one to sweep after KROIL
Since it is not a lube -- it is a cleaner.

I agree. When I do finally decide to clean some bores, I soak in Kroil first, patch out, then Wipe-Out foam for 1-20 hours depending on how sidetracked I get.

Geebubya what role does the potato peeler in the second pic play in your cleaning protocol?

not only do I stir mortar with a fork.......



but perhaps you catch my drift!

ya!


GWB

Got it, makes perfect sense to me. Carry on...............

First off, I shoot moly plated bullets in everything.

Second, I haven't used a brass brush in years, strictly nylon.

Third, every time.

Fourth, I don't have any factory barrels......

1st, I push a couple of patches with Bore Tech Eliminator, then about ten passes with the brush, patch once, another 10 passes with the brush, and a squirt of BT in the solvent port, and let it sit for a bit. I never totally exit the muzzle.

Come back, run a couple patches through it, then wrap a patch around an under sized brass brush with a little JB, and short stroke your way back and forth down the barrel. Pull it out, re-wrap the patch, and do it again w/o adding JB. I might do this 3-4 times. I re-use these patches all the time, starting with a well used one, progressing to a barely used or new, continually rotating down the line.

Put 4-5 drops of Kroil on a patch, push it through, flip it over & through again. Pull out the bore guide, clean the chamber & lugs, put the BG back in, and another patch with 3-4 drops of Kroil twice through, grease the bolt lugs and call it a day.

Not counting the wait, I can be done in 10-15 minutes.

First, I use a good solvent like Montana Extreme to get the copper and a lot of the carbon fouling out. Then, about every 250-500 rounds I follow the solvent with a couple patches loaded with JB. Then I follow that up with Kroil.

The JB gets out carbon that most solvents have trouble with. But, the real reason to use JB is to polish the fire cracking in the throat. I think barrels shoot better for longer when you keep the fire cracking under control.

Like geedubya I use JB on a brand new barrel for "break in" and polish. Then I apply Dyna Tech. This has worked well to keep barrels from fouling. After that I haven't used anything but Wipe Out for cleaning. JB is also good on old/pitted or very dirty bores.

Kroil is used as a penetrating oil for stuck screws ect.

I really don't know how JB stays in business. I bought one small tub 20 + years ago and it will surely last the rest of my life!

At one time, I had a pic of all the little empty tubs of JB I had thrown in a pail. Of course I've been using it from back before Jim sold out. Even talked to him on the phone once, as I had a question about something.

I clean all the time every time with it......

LOL, different strokes I guess. You tried Wipe Out yet?

I haven't, I'm in my happy place and never saw the need.

A bore scope can be a good teacher.......

Plus 1 on the bore scope.

Tater peeler? Well, there is multi-tasking while waiting........

Guilty! Use both together.....and sometimes separately. Kroil is my go to gun cleaner.

I did, until I started using Wipe Out.

I have an old 336 that just won’t Group. I’m going to give JB a shot. I bought a little container of it a while back but haven’t seen a need for it.

dye,

How are you applying it? Soak a patch or just wet it slightly? Do you clean the barrel before you shoot it after applying the Smooth-Kote?

Used to use JB every time I cleaned but now I use it only on new barrels like Gedubya and others and when prepping for a treatment of Dyna bore Coat. Just started using this and I think I will have less need of the JB after the treatment. Kroil is a good product but I make Ed's red by the gallon and add extra acetone to it if I need a penetrating oil. I use something else as a corrosion preventative. JB helped when I had a really stubborn shot gun to clean. It must have had layers or plastic and carbon like the rings of a red wood tree inside it even though it looked clean to the naked eye.

Kroil mixed with Shooters choice was the best around a while back, now there are several good products available. I use whatever is handy.

I haven't used them since I stopped shooting moly. I only stopped shooting moly because I was changing components too fast and it took too long to coat so many different bullets in small batches.

For me, moly only stopped the copper fouling in aftermarket barrels, my factory barrels were too rough. It did, however, seem to slow throat wear a lot. An example .. I had a .220 Swift in a 700 VSSF which I put over 2000 rounds through, all moly coated bullets. I assumed it was about used up so I consigned it to buy something else. A few days later the store owner and a perspective buyer called me to ask what was wrong with the gun. To their eye with a bore scope it looked like less than 200 rounds worth of wear, not 2000 .. and I was running a fairly hot load of 43.5 grains of H380 under 50 grain ballistic tips. I am convinced it works for extending barrel life even if it is not reducing fouling.

Tom

I mix JB with Hoppe’s No.9. Been doing it for a very long time.

I mix a couple of drops of Hoppes #9 in a shot glass of Chartreuse and I always sleep through the night.