[Tape]

I plan on going to the range Monday and wanted to clean my rifle. I borescope and found the pictures below. Can anybody explain to me what I'm looking at. This is the only grove inside the barrel that is effected, it's approximately 4 o'clock while looking into the barrel. It starts in the chamber and extends about 1.5” It doesn't look very well to me.

BTW I have the wrong date printed on the picture. My fault

Picture below is X 1.5 from the picture above it.

 

[JACKTW]

I've seen worse chatter than that and cleared it up with fire lapping the bbl. Then again, shooting all copper projectiles will fill the chatter, just don't use a brass brush to clean your bbl and the copper will fill and smooth it. I use a nylon brush and a little copper filling imperfections doesn't hurt. Just keep an eye on it.

If it were my rifle, I'd start with fire lapping the bbl.

Jack

 

[Tape]

Thank you, Jack. What causes it? All I shoot is copper coated bullets.

 

[deaddeerwalking]

That looks like carbon to me

 

[Tape]

That looks like carbon to me

It looks like whatever it is, its welded to the grooves.

 

[deaddeerwalking]

Try cleaning it with carbon remover. C4 from boretech works well

 

[navajo]

is this rifle known to be inaccurate? If the answer is no, then why do you assume this is a problem? Maybe you don’t?
All I’m saying is don’t pole vault over a mouse turd. I’ve owned rifles with horrid rifling that shot fine, still own one. If it’s not a problem don’t make a problem out of it.

 

[Tape]

is this rifle known to be inaccurate? If the answer is no, then why do you assume this is a problem? Maybe you don’t?
All I’m saying is don’t pole vault over a mouse turd. I’ve owned rifles with horrid rifling that shot fine, still own one. If it’s not a problem don’t make a problem out of it.

If your cars rotor has grooves cut in it; it stops fine, is it not a problem?
I'm the type of person that tries to stop a problem before it progresses. If the barrel is not a problem, then I won't worry about it. I know it didn't come from the factory this way.

 

[JACKTW]

Thank you, Jack. What causes it? All I shoot is copper coated bullets.

Well, I'm no barrel engineer but from what I understand, chatter can be caused by worn tooling, mainly the button drawn through the bore to cut the rifling.

By the picture, it doesn't appear to be carbon but it's worth a try to remove. Then again, fire lapping would remove it and remove all imperfections and smooth your entire bbl. It makes cleaning easier and often improves accuracy. It's a win win.

Jack

 

[rob42049]

JB Bore Paste is non-erosive and non-embedding. Clean the barrel with JB according to directions, then scope it again. If you still see the rough spot, then fire lap.

 

[Tape]

JB Bore Paste is non-erosive and non-embedding. Clean the barrel with JB according to directions, then scope it again. If you still see the rough spot, then fire lap.

Thank you rob42049 I'm going to try some similar paste and then I'll show the results if there's any improvements, if not, I'll just carry it to the range Monday and get some 50 yard groupings.

 

[leverbros]

Looks like a land part of the rifling that either got over heated at one time or, like others here have suggested, chatter marks from the rifling cutting process or both.

 

[Tape]

Looks like a land part of the rifling that either got over heated at one time or, like others here have suggested, chatter marks from the rifling cutting process or both.

If it was tooling, I would think it would be completely chattered, not just 2” on just the groove but I don't know nothing about rifling cutting.

 

[deaddeerwalking]

It’s not a chatter mark, it’s a carbon buildup. Look at the color.

 

[444pistol]

What kind of accuracy are you getting from said rifle? Has the accuracy diminished recently? If you are still getting decent accuracy and nothing has changed recently why worry. I have a 1973 Remington 700 243 that has not had a brush down the barrel in 25+ yrs, yes you read that right 25 years. The first 3-4 inches of the barrel barely show signs of rifling (as in eroded) but said gun will print 5 in .5" @ 100 yards plus kill whatever I aim it at up to 400 yards. Should I clean the inside of the barrel? I don't think so, as long as I keep getting the accuracy I'm getting now there's no reason to clean it. Just my opinion. Not all of my rifles are treated that way. It's kind of a test, a friend of mine told me 25 years ago that that barrel was "toast" and needed replaced. Every time we get together and shoot I drag that old 243 out and prove him wrong. Sorry for the rambling.

BTW the above mentioned 243 has well over 4K rounds through it.


Tim

 

[Whig]

The marks have depth with carbon in them.

However this barrel bore was cut, part of the tooling was damaged and created this chatter. It was from original tooling used for the bore cut. If the rifling is intact and the crown is clean and symmetric, this will probably not affect the accuracy at all.

 

[Strugl4xsc]

My opinion is that those marks have been there since day one. Sometimes it gets in our heads after seeing these things. What some are saying when they say ignore it, is that nothing has changed and no true cure is available. This isn't easy for some once they have seen it even if it shoots great, and always has. I am one who can easily deal with it if it performs to my satisfaction, that said, I don't desire to scope the bore of any that continue to perform well.

Sent from my SM-S906U using Tapatalk

 

[graymustang]

That bore is one continuous set of tool marks, not that uncommon in micro groove barrels, fire lapping is a no brainer here, at least it will minimize it to the extent possible, this will lessen or eliminate the deposits noted, and make cleaning much easier..

 

[TnHunter356]

is this rifle known to be inaccurate? If the answer is no, then why do you assume this is a problem? Maybe you don’t?
All I’m saying is don’t pole vault over a mouse turd. I’ve owned rifles with horrid rifling that shot fine, still own one. If it’s not a problem don’t make a problem out of it.

Ding, ding, ding.... Winner, winner chicken dinner 👍👍

Some folks look for something to grouse about. Me, I shoot them (lots of them!) and only worry if they start acting grumpy.

 

[leverbros]

If that was surface carbon I would think that it could be scrubbed out with a bronze brush or some other kind of solvent. OTOH, it likely is not etched into the bore carbon either. So that leaves only 1 other possibility and that's rifling tool chatter marks from when the gun was new.