Gunsmithing Here's a nice factory chamber....

[Wannashootit]

Finished up a new Savage that was sent in for a bedding job on an HS Precision stock and some receiver/ truing work. Got it finished up and sent the requisite round down the tube into the bullet trap and... stuck bolt. Beat it open, and surprise! Errant chip under the reamer flute as it was being withdrawn from the chamber is my guess, perfect "thread" scoring.

Since I wasn't doing any barrel work I had no reason to inspect the chamber, just pulled it to do my thing and reinstalled it. The REALLY odd thing, I cannot explain, is that the customer sent two boxes of Hornady factory ammo down the tube before re-stocking it and sending it to me- and his brass showed no evidence of this. And, I used Hornady ammo for the test firing- but it was the Interlock bullet hunting rounds and not the target ammo. I thought a lighter pressure round might explain why his brass didn't look like this, but I don't see how that's the case, here.

Puzzling. So, here's how not to cut a chamber- and if anyone has a logical explanation as to how his two boxes of factory ammo didn't do this, I'd love to be enlightened.

[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/i.imgur.com\/y0w9Atvl.jpg"}[/IMG2]


[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/i.imgur.com\/jMOC01Kl.jpg"}[/IMG2]

 

[Gene Poole]

Looks like the wrong "handed-ness" for happening during a reamer withdrawal but hard to tell from the pictures. Getting a chip caught in a counter-clockwise rotating barrel while pulling out would leave a "left" handed thread.

 

[Mordamer]

Thank you for sharing. That is an interesting set of pictures. I guess visual inspection is just too time consuming to perform these days on a production line.

 

[Supersubes]

Very interesting! Wonder what the throat looks like? What does the customer want to do with it?

 

[Gene Poole]

I'm still wondering if this could be something else. It looks too suspicious; threads are too "regular". What is the pitch of that thread? Would be interesting if it matched the tenon pitch. Like something jammed in there while the owner tried to unscrew the barrel. Or trying to remove a broken case with a tap that was too big?

 

[Wannashootit]

Owner seems to be straight-up. I was worried that I'd be accused somehow even though I didn't touch the barrel other than to remove it.
Savage CS was the typical bullshit..."Send it in and our technicians will diagnose the problem". Jeezus....
Customer isn't thrilled about being without his new rifle even longer now, so...

Given the quality of the Savage factory barrels is usually quite good, we decided I'll puIl the barrel and get a better look with a scope since it appears from the brass the damage doesn't extend as far as the shoulder. If the leade and the rest of the barrel looks good I'm just going to deepen the chamber. I'm a dinosaur with a manual lathe but my micrometer reamer stop makes it easy to know within a half thou how much- deeper I've gone and then just set back the breech the same distance. Luckily it's a Savage so there's no concern about specific tenon length, shouldn't take too much depth to clean it up and even with the thicker Holland's lug I won't need to pick up/ extend the threads.

I'm going to do the reaming by hand since it's minimal and will follow the original chamber cut just like a short-chambered barrel. I still have reservations given its a barrel under warranty, but customer has agreed that I'm not going to be responsible if it doesn't shoot...and if that ends up the unlikely case we'll slap a CBI on it.

 

[Dai Bando]

Why not just chuck it in the lathe and polish the chamber?

 

[...]

Why not just chuck it in the lathe and polish the chamber?

yeah....thats not gonna just "polish out"......

that needs to be recut

 

[Twinsen]

Almost bought a Remington once. Had a huge ring in the chamber. I don't know how they pulled it off. Clearly, a reamer never touched the chamber, but how did they create the ring?! Fly cutters?!

 

[300sniper]

Finished up a new Savage that was sent in for a bedding job on an HS Precision stock and some receiver/ truing work. Got it finished up and sent the requisite round down the tube into the bullet trap and... stuck bolt. Beat it open, and surprise! Errant chip under the reamer flute as it was being withdrawn from the chamber is my guess, perfect "thread" scoring.

Since I wasn't doing any barrel work I had no reason to inspect the chamber, just pulled it to do my thing and reinstalled it. The REALLY odd thing, I cannot explain, is that the customer sent two boxes of Hornady factory ammo down the tube before re-stocking it and sending it to me- and his brass showed no evidence of this. And, I used Hornady ammo for the test firing- but it was the Interlock bullet hunting rounds and not the target ammo. I thought a lighter pressure round might explain why his brass didn't look like this, but I don't see how that's the case, here.

Puzzling. So, here's how not to cut a chamber- and if anyone has a logical explanation as to how his two boxes of factory ammo didn't do this, I'd love to be enlightened.

out of curiosity, why do you remove a barrel to bed a stock?

 

[lash]

He was doing some receiver/truing work...first sentence.

 

[300sniper]

He was doing some receiver/truing work...first sentence.

Lol, my bad. Completely missed that.

 

[ajwcotton]

Put a pitch gauge on it and see if it's close to anything just for shits and gigs.

 

[BillyGoatMachine]

Very strange. Looks like a Savage/Larue love child with an Xtran chamber!!! I'd ream it out as well.

 

[alexander66]

I had a similar occurrence with my brand new 300 WM Remington 5R with a burr in the chamber, fortunately I was able polish the chamber myself to correct the problem. The same rifle had other minor issues related to poor quality control. Consequently I am done with any future Remington brand rifles.

 

[Shanerbanner10]

Just throw the reamer in a dewalt and let-r-rip!

 

[Wannashootit]

Just throw the reamer in a dewalt and let-r-rip!

You betcha!
Perfect opportunity to try out my new floating drill chuck!

 

[skeetlee]

i think id just cut the end off and rechamber. or better yet send that piece of junk back to savage. im glad you got the bolt open. that could have been a real issue. lee