JB Bore bright ?

[JMayo]

ask a fisherman what happens to the prop shaft when fishing line gets wrapped up behind the prop

Ruins seals ...doesn't scar metal.
Still that doesn't explain those aggressive ditches down but none on top.

 

[Dusty Stevens]

Ruins seals ...doesn't scar metal.
Still that doesn't explain those aggressive ditches down but none on top.

Theyll cut a groove in a shaft real quick. And the bristles can not rub down in a groove like they can on a land. They just skip over the groove

 

[BDman]

I've never had an issue cleaning with nylon or bronze brushes, the bore is patched out first = relatively clean. But, I've seen some ugly bores that were JB'd using those same brush types. Patches only for JB or any abrasive and minimal use with any of it. JMHO.

 

[paulT]

I use an undersized nylon brush with a patch with JB applied wrapped around the brush and find this meathod seems to fit snugly in the bore and follow rifling well whielst short stroking first 7 inches of barrel and giving rest of barrel a few passes making sure not to be too aggressive in rest of barrel and crown areas i also use my Borescope to determin condition of barrel both before and during and after cleaning regieme.

 

[Ccrider]

I use an undersized nylon brush with a patch with JB applied wrapped around the brush and find this meathod seems to fit snugly in the bore and follow rifling well whielst short stroking first 7 inches of barrel and giving rest of barrel a few passes making sure not to be too aggressive in rest of barrel and crown areas i also use my Borescope to determin condition of barrel both before and during and after cleaning regieme.

Exactly what I have migrated to doing, except I use a worn bronze brush, not nylon, after finding that none of the chemicals get that hard fouling out of the first 10 inches of the bore. And, I have tried a long list of them.

 

[MarkG]

Very interesting ... However those rivers in the grooves seem really aggressive with no corresponding marks on lans and the edges still show sharpness.
It's So agressive I go "hummm" gotta be something else involved....

But I'm sold on patches only with jb untill barrel is in on its last leg.

I agree. Nylon will not scratch steel but a nylon brush with lots of abrasive certainly will. Regarding the picture, it’s seems likely using a brush with abrasive will act more on the grooves as opposed to the lans.

 

[mrh1958]

Thanks for this info, very interesting read.

 

[Pawnee Bill]

I decided to run a patch using JB Bore Bright thru my previously "cleaned" Sako 22-250 chromoly factory bbl while I was checking resized brass dimensions.

To my surprise, the clean barrel looked like this...

So I then cleaned with brushes, patches using Butch's -my standard until clean. Then ran some more JB Bore bright thru, expecting to see a pretty clean patch. Instead- more patches that were blackish.

I'd like to think the rifling looks clearer peering down the bore after. Not sure.

I used to shoot V Max moly coated quite a bit years back.

Thoughts?

I have other cut rifled SS barrels and they clean up quite quickly.

any info appreciated. I did a search on this site & read a few remarks.

View attachment 1038127

Did you check it with a borescope?

 

[Martin52]

After using bronze and nylon brushes, spear tip jags and VFG pellets, I'm getting better results using a solvent soaked patch wrapped around a parker hale jag for carbon removal, and when needed, JB paste with oil on a patch also on a PH jag. This type of jag seems to give a larger cleaning area that is in contact with the bore and also gets right into the grooves. This is for my FTR .308 barrel that has shown long hard black carbon streaks, I think not so much from the lack of cleaning, more that I might not have been able to clean until several days after a match so the carbon has just hardened in the bore. I do have a borescope. When I have used JB, I get a grey slurry coming out on the patches and have to use maybe 6-8 patches before its all out. Wash out then with mineral spirits.

 

[Steve Ladino]

Every patch you run thru will look like that- even if you rub on the outside. Its a metal polish- thats the black

I notice a darker black when first patching with pastes that shows lesser black intensity after a few passes. I think this is the product removing carbon in the first 7-10 inches past the chamber.

 

[PopCharlie]

I personally like KG-1 for carbon fouling and KG-12 for copper.

Terry

Ditto! This combination works very well, IMO.

 

[Dusty Stevens]

I notice a darker black when first patching with pastes that shows lesser black intensity after a few passes. I think this is the product removing carbon in the first 7-10 inches past the chamber.

It is but its easy to rub it on the outside of the barrel and see if it turns black there too

 

[jelenko]

I've never gotten JB or Flitz to not show black even after multiple passes on 'clean' stainless - e.g., the outside of a barrel.
Oddly, I've found the first couple 'scrubbings' in the throat area [say 10 complete cycles] sometimes come out still basically the same color. It's only after the first one or two scrubbings that the patch turns black. This is with a patch wrapped around the jag.