Palma barrel bore abnormalities

[istp79gd]

Does anyone know what is going on in the bore of my barrel? New barrel with 393 rounds on it since January. Whatever those marks are start in the last 6” before the muzzle and you can feel it with a tight patch or brush. There are 7 to 10 patches of whatever it is in a 2-3” section of barrel.

Thanks- David

 

[Dusty Stevens]

Ever shot moly in there?

 

[istp79gd]

No, never shot moly coated. I’ve only shot Berger 155 hybrids.

 

[akajun]

Looks like pitting from rust that’s had the rust blown out of it
What kind of barrel

 

[istp79gd]

Button rifled .308 with 95’ Palma chamber. Can pitting be raised up like that?

 

[clowdis]

Looks like moisture to me. Maybe gun oil? Looks raised up not cratered out.

 

[Liven The Dream]

Contact the Barrel Maker .
I am not a name dropper ,but second Button Rifle Barrel story in 3 days.
Short life on two barrels from the same place ?

 

[istp79gd]

Hey Blair- It was acting weird at Butner on Friday with a lot of vertical. I cleaned it again and it shot a little better Saturday. 147-5x in team match with two out the right for wind and a 12oclock 9.
I cleaned again when I got home and was surprised to see that in the bore.

 

[akajun]

Looks like moisture to me. Maybe gun oil? Looks raised up not cratered out.

I think that’s an optical illusion from the scope

 

[istp79gd]

It definitely looks raised to me but I don’t know what I’m looking at. It starts 4.5” from the muzzle and goes back 6.5” on all sides of the bore. The rest of the barrel looks great.

 

[istp79gd]

Could be. I know it sure grabs a patch or a brush

 

[gme]

galvanic corrosion can occur when copper deposits are left in the bore combined with humidity

 

[jelenko]

galvanic corrosion can occur when copper deposits are left in the bore combined with humidity

What kind of time period is needed for the copper/moisture to start showing the corrosion?

 

[gme]

What kind of time period is needed for the copper/moisture to start showing the corrosion?

I think it depends on the humidity level (carbon deposits absorb moisture, high humidity prevents it from drying out), also the acidity level left by the primer residue

 

[istp79gd]

Thanks to all! There is a ton of knowledge and information on this site and I appreciate you sharing it.

 

[rijndael]

@FrankG, from Bartlein, commented on a similar barrel issue on Snipers Hide:

https://www.snipershide.com/shooting/threads/wtf-barrel-worms.7104163/post-9910771

 

[whatsupdoc]

That is not raised that is pitting or etching.

 

[rijndael]

That is not raised that is pitting or etching.

That's my thought as well. The patch feels tighter from friction and not a reduction in diameter.

 

[DShortt]

I agree with the others, that's pitting and the light is playing some tricks. Something got left in that barrel and it corroded. Bad news especially if it shot well before.

 

[Rtheurer]

Looks like what i see with Rust pitting. As long as its not on the crown i have had barrels still shoot lights out just as it did before. Get it out at the last inch or so... seems like that will be the end of the rifle shooting well anymore.

The moly cvomment was about how it attracts and captures moisture so you can get pitting pretty easy with moly in high humid locations like the south.