Borescope pics- anybody guess what this is?

[Dusty Stevens]

Some of you guys thats been around a while will recognize this damage. Anybody want to guess?

 

[ckaberna]

Lint?

 

[Dusty Stevens]

No its pits

 

[JFrank]

Map of Ukraine??

 

[Rustytigwire]

Corrosion of some sort but by what? Moly residue sulfur?
Good photos!
Metal mites lol

 

[Dusty Stevens]

^ yes its from moly and not cleaning since he heard you dont have to clean if you use moly

 

[Cecil S.]

Damn and I thought Biology would be the answer here. LOL

 

[Dusty Stevens]

Damn and I thought Biology would be the answer here. LOL

Could be a new amoeba

 

[Cecil S.]

Could be a new amoeba

LOL.....But then again I am the newbie on here and I go with what you guys say.....hahahaha

 

[Ned Ludd]

Those marks are a liberal's definition of the shortest distance between two points.

 

[Brians356]

I doubt that etching is deep enough to affect accuracy. Is it chromoly or stainless?
-

 

[Al Lu]

Dusty, what kind of borescope took those picture if I may ask? Thanks.

 

[hogpatrol]

They're old boreworm trails. Similar to wood borers, they eat the metal and leave a trail of destruction. Generally, don't affect accuracy but in cleaning will cause patches to have a blue tint. They're a barrelmaker's best friend.

 

[Tom Baker]

Borescopes have nearly ruined my life. I don't know why I have 3 of them.

 

[dmoran]

Have repeatedly seen "etched erosion" under layered copper fouling that remained in barrels for long periods of time.

 

[dolek]

Have repeatedly seen "etched erosion" under layered copper fouling that remained in barrels for long periods of time.

View attachment 1153750

I have found the same recently , that 50 dollar investment(Teslong) has changed my mind about collecting old deer rifles . Those shiny on the outside gems sure can be ugly on the inside.

 

[rwj]

Have repeatedly seen "etched erosion" under layered copper fouling that remained in barrels for long periods of time.

View attachment 1153750

If it’s occurring under a layer of copper, would it be considered erosion or corrosion? I think of erosion as being mechanically induced (sliding contact between bullet/bore and impingement of hot gasses), and corrosion as a chemical process (galvanic reaction between dissimilar metals?). Not meaning to be “picky”, just trying to understand the phenomenon!

 

[jim_k]

^ yes its from moly and not cleaning since he heard you dont have to clean if you use moly

Thanks for posting!

 

[golong]

Unless you checked before you ever fired a shot, it may not be from you. I have seen pitting and such in NEW factory barrels from Savage, T/C, and Marlin.

 

[maxscm]

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