Odd Cracks in Barrel

[Jud96]

Hey guys. So I got a Teslong borescope and decided to check out some of my barrels with it. One of them was my problematic .22BR that I haven’t been able to get to shoot consistently. There was some very very minor fire cracking in the first 1/2 inch of barrel, but it has roughly 250 shots on it so that’s to be expected. However, from the muzzle and back about 4” there’s some really weird cracks in the barrel. I took a couple photos to show you guys. I can see them with the naked eye and a flashlight. I was curious if anyone knows what these are? Thanks

 

[newbieshooter]

another reference?: https://forum.accurateshooter.com/threads/bore-worms.4008439/

 

[timeout]

I'm no expert but I have seen lint as in cleaning patch lint look similar in a Teslong pic. Also appears like you have a bit of a copper mine going on. Edit: you said that they are visible to the naked eye. That rules out lint.

 

[Jud96]

another reference?: https://forum.accurateshooter.com/threads/bore-worms.4008439/

Thank you! That’s interesting

 

[Jud96]

I'm no expert but I have seen lint as in cleaning patch lint look similar in a Teslong pic. Also appears like you have a bit of a copper mine going on.

Yeah. This barrel hasn’t been the best. I cleaned it about 50 shots ago. I cleaned it with Boretech until the patches came out clean of blue. Not sure why it would copper foul so bad. It’s a cut rifled custom barrel.

 

[Coonman300]

I’m no expert but I call those “worm tracks”. Don t know if it is inclusions in the metal or what but I have an old 22-250 that has so much of that as well as major pitting from severe neglect over the years that you wouldn’t think the gun could hit a bus at 50 yards. It consistently shoots .5 MOA and I’m not a great shot compared to most on here. I now use my teslong to confirm cleaning and I don’t worry about the rest. Lol

 

[Just Say Moe]

You've got worms. Run a couple patches of ivermectin through it.



Interesting though.

 

[JohnKielly]

Yeah. This barrel hasn’t been the best. I cleaned it about 50 shots ago. I cleaned it with Boretech until the patches came out clean of blue. Not sure why it would copper foul so bad. It’s a cut rifled custom barrel.

Do you clean every time you use it?

 

[46and2]

Hey guys. So I got a Teslong borescope and decided to check out some of my barrels with it. One of them was my problematic .22BR that I haven’t been able to get to shoot consistently. There was some very very minor fire cracking in the first 1/2 inch of barrel, but it has roughly 250 shots on it so that’s to be expected. However, from the muzzle and back about 4” there’s some really weird cracks in the barrel. I took a couple photos to show you guys. I can see them with the naked eye and a flashlight. I was curious if anyone knows what these are? Thanks View attachment 1275387View attachment 1275388View attachment 1275389View attachment 1275390View attachment 1275390

What powder do you shoot in this barrel? How far up the barrel is this 'worm'?

 

[Tommie]

Do you shoot moly bullets?

 

[joshb]

Yup! Bore worms!

 

[clowdis]

Corrosion or rust. Maybe from not cleaning or condensation from moving the rifle from cold to hot environment or hot to cold environment. Stainless will rust.

 

[Straightshooter1]

We know that there are bacteria that consumes iron and steel . . . even stainless steel. From the looks of this kind of corrosion, it makes me think it could be some type of bacteria at work . . . ???

Microbial corrosion of stainless steel - PubMed

Stainless steel, developed because of their greater resistance to corrosion in different aggressive environments, have proved to be affected, however, by various processes and types of corrosion. Some of these types of corrosion, mainly pitting, is activated and developed in the presence of...

pubmed.ncbi.nlm.nih.gov

 

[Brians356]

What you don't know from the photos is how deep those are, but I can say without a doubt they are not nearly as deep as they look. Nothing seen through a bore scope is. It's not unlikely that if you could get a fingertip on them you wouldn't be able to feel them. I've got a hunting barrel with similar artifacts that shoots fine. Would it shoot a better without them? I'll never know.
-

 

[edwardware]

. . . there’s some really weird cracks

Every non-hammer-forged factory-made barrel I own shows those. The consistency leads me to think they they are inclusions in the steel blank.

Hammer-forged (Remington) barrels show a similar thing, but they appear closed.

 

[CharlieNC]

All my brand new top tier barrels come equipped with them as well. A higher grade steel would be clear, but obviously at a much higher cost.

 

[Mark Buettgen]

Hey Guy's,
We see this quite a bit, it's simply corrosion from moisture in the bore.
Later, Mark Buettgen
Bartlein Barrels Inc.

 

[Jud96]

Do you clean every time you use it?

No I don’t.

 

[Jud96]

What powder do you shoot in this barrel? How far up the barrel is this 'worm'?

I’ve tried IMR 4895, H4895, and IMR 4451. The worms are from the muzzle to about 4” back from the muzzle.

 

[Jud96]

Do you shoot moly bullets?

No