Grooves in my grooves?

[thefitter]

Just scoped a new rifle I have been developing loads for to see if I had the dreaded CARBON RING yet, I have discovered that I have small marks running perpendicular to the grooves in the grooves for the first .25" - .38" of the grooves. They are in every groove and very consistent. I have never seen this before in any of my barrels.

What the .... are they from?

Thanks

 

[jonbearman]

Probably reamer marks which are common in certain barrels. What kind of barrel is it?

 

[Jason Boersma]

I've seen some scary stuff but usually after 100 rounds it's all gone.

 

[thefitter]

Probably reamer marks which are common in certain barrels. What kind of barrel is it?

7mm-08 bartlein in a AR10 platform.

 

[BradY]

Dont use abrasives on a bristle brush do you?

 

[dkhunt14]

Are you sure it is in the grooves and not on the lands? If it is on the lands it is from the chamber reamer. Sometimes depth is hard to tell with a borescope. Matt

 

[Alex Wheeler]

If its in the grooves its probably chatter from the button.

 

[johara1]

Alex,I didn't know Bartlien was using a button……… jim

 

[Wolfdawg]

Some firearm manufacturers were intentionally adding extra "grooves" on the lands of their barrels in an attempt to make the bullets more easily identifiable to forensic Ballistics Examiners.

The ones I have seen were all pistols and they were all on the lands, not the grooves.

Wolfdawg

 

[thefitter]

Are you sure it is in the grooves and not on the lands? If it is on the lands it is from the chamber reamer. Sometimes depth is hard to tell with a borescope. Matt

Pretty sure, but I get what you are saying.

 

[thefitter]

Some firearm manufacturers were intentionally adding extra "grooves" on the lands of their barrels in an attempt to make the bullets more easily identifiable to forensic Ballistics Examiners.

The ones I have seen were all pistols and they were all on the lands, not the grooves.

Wolfdawg

Curses foiled again!

 

[Alex Wheeler]

Alex,I didn't know Bartlien was using a button……… jim

Oops, I missed that. Well, then there cant be grooves in there, Bartlien doesnt make bad barrels :