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#5673613 - 03/28/15 01:37 PM Re-chamber question
BassCat'99 Offline
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Registered: 02/15/13
Posts: 1142
Loc: Stratford Texas
You have a quality barrel chambered for .308 win. Could you re-chamber for the .300 BO?
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#5673621 - 03/28/15 01:46 PM Re: Re-chamber question [Re: BassCat'99]
Classic Rocks Offline
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Registered: 09/18/12
Posts: 1913
Not that I am aware of. Or at least not with out some sort of insert.

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#5673624 - 03/28/15 01:47 PM Re: Re-chamber question [Re: BassCat'99]
dee Offline
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Registered: 04/10/10
Posts: 5017
Loc: Red River way
If there is enough shank material left since the original chamber will have to be cut off.
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#5673636 - 03/28/15 02:08 PM Re: Re-chamber question [Re: BassCat'99]
BassCat'99 Offline
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Registered: 02/15/13
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Loc: Stratford Texas
I think so, I thought that the case diameter would be the problem.
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#5673656 - 03/28/15 02:45 PM Re: Re-chamber question [Re: BassCat'99]
SingleShot85 Offline


Registered: 05/27/09
Posts: 1786
Loc: S.A. and Kinney Co.
Case diameter makes no difference, as long as you have enough room to cut and rethread you are gtg.

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#5673684 - 03/28/15 03:14 PM Re: Re-chamber question [Re: BassCat'99]
BassCat'99 Offline
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Registered: 02/15/13
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Loc: Stratford Texas
Are you sure? Seems to me the case will rattle around in there.
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#5673762 - 03/28/15 05:00 PM Re: Re-chamber question [Re: BassCat'99]
10ring Offline
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Registered: 11/19/12
Posts: 840
Loc: Pilot Point, TX
I don't see how it could be done the .308 case is quite a bit larger in diameter than the 300blk. The bore is obviously the same but the chamber dimensions are way different. It wouldn't be as easy as just shortening a 308 chamber to the length of 300blk. "I don't think", maybe someone would have another way of looking at it.

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#5673798 - 03/28/15 05:25 PM Re: Re-chamber question [Re: BassCat'99]
Judd Offline


Registered: 01/22/09
Posts: 11280
Loc: Sachse, TX
You cut the entire chamber off and start with a fresh barrel. That is why they asked about the barrel diameter. It can be done depending on the barrel contour.
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#5673835 - 03/28/15 06:14 PM Re: Re-chamber question [Re: BassCat'99]
Buzzsaw Offline
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Registered: 06/29/11
Posts: 9428
Loc: Frisco, Texas
HUH??? rofl
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#5673855 - 03/28/15 06:37 PM Re: Re-chamber question [Re: Judd]
FiremanJG Offline
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Registered: 12/16/08
Posts: 21142
Loc: Wolfe City, TX
Originally Posted By: Judd
You cut the entire chamber off and start with a fresh barrel. That is why they asked about the barrel diameter. It can be done depending on the barrel contour.


If you had enough shank you could make that 308 Win barrel into a 300 B.O., .30-06, .300 Win Mag, 300 Rem Ultra Mag.

Still a thirty caliber barrel.


Edited by FiremanJG (03/28/15 06:40 PM)
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#5673867 - 03/28/15 06:52 PM Re: Re-chamber question [Re: 10ring]
nsmike Online   content
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Registered: 05/02/12
Posts: 4399
Loc: MN
Originally Posted By: 10ring
I don't see how it could be done the .308 case is quite a bit larger in diameter than the 300blk. The bore is obviously the same but the chamber dimensions are way different. It wouldn't be as easy as just shortening a 308 chamber to the length of 300blk. "I don't think", maybe someone would have another way of looking at it.

Let's try a little different way of explaining it. If there is enough barrel thickness ahead of the current chamber, that portion can be cut off leaving you with an unchambered rifled barrel. You would then have to cut new threads and a new chamber. It will not work with most barrel tapers but with an untapered barrel it can be done as long as it's not excessively shortened.
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#5673879 - 03/28/15 07:06 PM Re: Re-chamber question [Re: nsmike]
10ring Offline
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Registered: 11/19/12
Posts: 840
Loc: Pilot Point, TX
Originally Posted By: nsmike
Originally Posted By: 10ring
I don't see how it could be done the .308 case is quite a bit larger in diameter than the 300blk. The bore is obviously the same but the chamber dimensions are way different. It wouldn't be as easy as just shortening a 308 chamber to the length of 300blk. "I don't think", maybe someone would have another way of looking at it.

Let's try a little different way of explaining it. If there is enough barrel thickness ahead of the current chamber, that portion can be cut off leaving you with an unchambered rifled barrel. You would then have to cut new threads and a new chamber. It will not work with most barrel tapers but with an untapered barrel it can be done as long as it's not excessively shortened.


10-4... I got ya. I can see where that works. I didn't consider cutting the chamber completely off and starting fresh. "If the barrel contour allowed it". up

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#5673936 - 03/28/15 07:53 PM Re: Re-chamber question [Re: BassCat'99]
Buzzsaw Offline
THF Trophy Hunter

Registered: 06/29/11
Posts: 9428
Loc: Frisco, Texas
so being devils advocate, sorry drunk trolling But WTF???
Wouldn't it be cheaper to buy an new barrel.

if BOLT GUN....DOUBLE wtf???

stick with .308 or buy a .300 BO in an AR platform for which it was intended

Or are you just posting to see how many people read this???

again sorry

let's talk about something cool................. troll
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#5674014 - 03/28/15 08:58 PM Re: Re-chamber question [Re: BassCat'99]
BassCat'99 Offline
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Registered: 02/15/13
Posts: 1142
Loc: Stratford Texas
Hey Buzz WTF I have asked a legit question and you call that a responsible intelligent answer? If ya don't have constructive advice keep it to your self.
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#5674156 - 03/28/15 10:47 PM Re: Re-chamber question [Re: BassCat'99]
ChadTRG42 Offline
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Registered: 09/16/09
Posts: 11040
Loc: Lewisville, TX
Can it be done, sure. Can it be done with your barrel? A gunsmith would have to take some measurements and see how long your barrel chamber area is. Also, if the rifle is a 308, you will have to change out the bolt face to a 223 bolt face. Plus any magazine changes.

If you look at the "B" lengths at the link below, this is what will determine if you can rechamber it or not.

http://www.bartleinbarrels.com/contours.htm
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