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Old 12-10-2017, 10:27 PM   #1
diamonde40
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Default TC Arms 308 Barrel Uncenterd Bore

Has anyone had any experience with what it will take to repair this problem other than replacing the barrel. I tried but could not get it to hold a pattern while sighting in and then had a gunsmith try the same and then he pointed out that the reason is the un-centered bore of the barrel which makes it move more due to less metal on one side of the barrel. Open for ideas.

Thanks
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Old 12-10-2017, 10:30 PM   #2
kenforu
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TC has a great customer service and should replace the barrel for you.
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Old 12-10-2017, 10:31 PM   #3
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Call Thompson I be they will replace it if it is a factory defect
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Old 12-10-2017, 10:36 PM   #4
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Quote:
Originally Posted by kenforu View Post
TC has a great customer service and should replace the barrel for you.
This!
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Old 12-10-2017, 11:56 PM   #5
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Quote:
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Call Thompson I be they will replace it if it is a factory defect
How could it not be

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Old 12-11-2017, 12:12 AM   #6
sendit
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....and here I thought Savage was the only ones offering barrels like that.

Contact T/C like others have stated.
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Old 12-11-2017, 12:33 AM   #7
cajuntec
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Quote:
Originally Posted by diamonde40 View Post
Has anyone had any experience with what it will take to repair this problem other than replacing the barrel. I tried but could not get it to hold a pattern while sighting in and then had a gunsmith try the same and then he pointed out that the reason is the un-centered bore of the barrel which makes it move more due to less metal on one side of the barrel. Open for ideas.

Thanks
Wow. Mind if I re-post your picture on some T/C sites?

Is this a Springfield MA barrel, or the old N.H. T/C barrel?

Looks like it's been cut down, as I'm seeing flutes where it would normally be smooth. Has it, or is the picture just making it look that way? Not that it should matter - that bore is way off center. Just wondering if it had also been cut down.

All the best,
Glenn
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Old 12-11-2017, 09:32 AM   #8
diamonde40
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Default No Problem

Quote:
Originally Posted by cajuntec View Post
Wow. Mind if I re-post your picture on some T/C sites?

Is this a Springfield MA barrel, or the old N.H. T/C barrel?

Looks like it's been cut down, as I'm seeing flutes where it would normally be smooth. Has it, or is the picture just making it look that way? Not that it should matter - that bore is way off center. Just wondering if it had also been cut down.

All the best,
Glenn
Don't mind the Re-Post anywhere.

Not sure about origin of the barrel. I bought it from someone else and if it was cut, which I don't know if it has or not, it is still not centered as you stated.
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Old 12-11-2017, 12:01 PM   #9
cajuntec
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Quote:
Originally Posted by diamonde40 View Post
Don't mind the Re-Post anywhere.

Not sure about origin of the barrel. I bought it from someone else and if it was cut, which I don't know if it has or not, it is still not centered as you stated.
Thank you. The reason I was thinking it may have been cut is because the ProHunter barrel's flutes don't go all the way to the muzzle. They stop a little bit before getting there, and go back to a solid barrel before getting to that point. If it were cut and recrowned, the flutes would go all the way to the muzzle without going back to solid before getting there. I know of many that cut these barrels down.

All the best,
Glenn
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Old 12-11-2017, 04:09 PM   #10
diamonde40
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Thanks for the information.
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Old 12-11-2017, 07:01 PM   #11
cajuntec
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What is the barrels current length?
All the best,
Glenn
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Old 12-11-2017, 07:16 PM   #12
diamonde40
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Default 308 Barrel Length

A picture of the length of the 308 barrel.
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Old 12-11-2017, 07:23 PM   #13
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If the barrel has been cut down, that could be the reason for that off center bore. Lots of barrels bores aren't centered all the way to the end. And, it most often doesn't affect accuracy. I owned a 40xb Remington .22/250 that was shortened to 22 inches that was more off center than that and it would shoot .35. If it was shortened, be sure the crown is OK. Here is something on the subject worth a look. http://benchrest.com/archive/index.php/t-61930.html

Last edited by softpoint; 12-11-2017 at 07:33 PM..
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Old 12-11-2017, 07:54 PM   #14
diamonde40
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Quote:
Originally Posted by softpoint View Post
If the barrel has been cut down, that could be the reason for that off center bore. Lots of barrels bores aren't centered all the way to the end. And, it most often doesn't affect accuracy. I owned a 40xb Remington .22/250 that was shortened to 22 inches that was more off center than that and it would shoot .35. If it was shortened, be sure the crown is OK. Here is something on the subject worth a look. http://benchrest.com/archive/index.php/t-61930.html
I see that information is from 2009. Thanks. I wonder if there is any more updated info. I as well as the gunsmith couldn't get it sighted in so I'm really hoping that TC Arms can help me out.
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Old 12-11-2017, 08:55 PM   #15
TexMax
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Sucks. But I don't see a reason to go shouting from the rooftop until you see what tc says. Not you op. It's possible it shoots fine and would present no issue unless you planned on threading but the non concentricity represents a qc issue regardless.
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Old 12-11-2017, 09:46 PM   #16
M16
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IIRC that barrel should be 28 inches. It is missing 4 inches so it has been cut.
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Old 12-11-2017, 09:53 PM   #17
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Before claiming the bore is offset, measure the bore thickness, on the top and bottom, with a dial caliper or digital caliper. I know the process that barrels are bored, it's very unlikely the bore is offset to one side. I am betting someone, cut the barrel, then tried to crown the muzzle, with a end mill, instead of using a lathe. If the muzzle was not crowned correctly, it won't shoot very well. I am not sure about the fluting going to the end of the muzzle. I have never seen any barrel machined that way, it does look like it has been cut down. Not sure if doing that will affect accuracy.
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Old 12-11-2017, 10:12 PM   #18
sendit
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That barrel has been cut and shortened. Other than giving it a good crown you are going to be on your own on it. T/C isn't going to do anything with it I wouldn't think.
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Old 12-11-2017, 10:15 PM   #19
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Nope replace. TC has a history of crappy barrels.
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Old 12-12-2017, 12:03 AM   #20
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I showed it to a couple of friends. One said he didn't see anything wrong with it at all.
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