Bore Machining Marks ?

hylander

Active member
Recieved a new Wilson barrel from Brownells for my Mauser.
I can see machining marks in the bore, mostly on the lands, enlarge the pic and you can see it on the bottom land.
Normal or send it back

IMG_2903.jpg
 
That's chatter from when they pulled the rifling button through.

A broach-cut barrel like Olympic Arms makes will reduce that a bunch, or you can have it lapped and get rid of most of the chatter marks (depending on how deep they are).

Or shoot it like that and keep an eye on the copper build-up. That's pretty normal for a button-cut barrel.
 
I used to lap bench rest rifles with a home made lap by taking a bronze brush in the muzzle pushed through from the breech to where it's about an inch and a half from the end, pour a higher tin content melted lead into the bore until it's out to the end, let it cool and push it through (hard knock to get it started.

Mark it so that it's oriented to the right lands, and use a baking soda toothpaste as a lapping compound. It puts an excellent polish to it.

In actuality though I would not be happy with a competition grade barrel that had chatter marks like that.

Stainless steel machines rougher than regular steel, leaves microscopic burrs and tool marks worse.
 
Originally Posted By: hylanderRecieved a new Wilson barrel from Brownells for my Mauser.
I can see machining marks in the bore, mostly on the lands, enlarge the pic and you can see it on the bottom land.
Normal or send it back

IMG_2903.jpg





The marks are not chatter, and they will not go away with "breaking in a barrel" (which does not happen)... and they cannot be removed with tooth paste. But the good news is, they will not cause any problems.

They are tool marks from the original drilling - just about all mass production barrels have them - they are fine and will do nothing bad - if you sent the barrel back, you will get another barrel with the same stuff - it is part of the way production barrels are made - if you want better barrels, you have to dig much deeper into your wallet.


.

 
Yep^^^

I wouldn't worry about it.
If Cooper Arms can make Wilson barrels shoot in their production rifles, a good smith shouldn't have a problem either.
JMO
 
Appreciate all the input
I could not get past the marks in the bore so I sent it back.
Thinking of ordering a Lothar Walther
 
I have a Savage with those same type machining marks. I have had two people try to buy it from me after seeing how great it shoots.
 
Savage barrels are known for such marks. They still shoot well, just don't clean so easily.

That barrel is a perfect candidate for Ultra Bore Coat.......
 
Originally Posted By: hylanderAppreciate all the input
I could not get past the marks in the bore so I sent it back.
Thinking of ordering a Lothar Walther


You might want to read this, it's from Lilja and explains the various processes:

Barrel rifling from Lilja
 
The marks are not chatter, and they will not go away with "breaking in a barrel" (which does not happen)... and they cannot be removed with tooth paste. But the good news is, they will not cause any problems.

They are tool marks from the original drilling - just about all mass production barrels have them - they are fine and will do nothing bad - if you sent the barrel back, you will get another barrel with the same stuff - it is part of the way production barrels are made - if you want better barrels, you have to dig much deeper into your wallet.



Yep, agree 100%. Definately not chatter from the button. The marks actually come from the chucking reamer that puts the barrel bore .001 under the button size which is done right after the deep hole drill. Sometimes the button will swage the marks out just as it swages in the rifling. Pretty rare in a Wilson barrel based on what I have seen. I have a Shilen that looks worse...but it shoots great and doesn't foul too bad. You probably shoulda kept that pipe...it might have made the best shooter you had.
 


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