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7mm Rem Mag rechamber?

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Unread 04-19-2008, 11:11 PM
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Join Date: Jul 2007
Location: Lansing, MI
Posts: 197
7mm Rem Mag rechamber?

Can a 7mm Rem Mag be re-chambered to 7mmSTW or 7mmRUM without having to set the barrel back? Thanks in advance.
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Unread 04-19-2008, 11:20 PM
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Join Date: Jul 2005
Location: Arkansas / Oklahoma / Boarder
Posts: 690

I would go with the 7 MM STW you will like it


Kill more Coyotes

Feed The Buzzards
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Unread 05-08-2011, 12:11 AM
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Join Date: May 2011
Posts: 2
Re: 7mm Rem Mag rechamber?

Why would you? what can you do with it that you can"t with what you already have? The Rem mag will take you into elk and black bear hunting and the others are really not any more sufficient for real dangerous game...... sincerely curious!
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Unread 05-08-2011, 02:00 AM
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Join Date: Apr 2003
Location: North Bend, Oregon
Posts: 1,537
Re: 7mm Rem Mag rechamber?

Looks like you could rechamber to the 7 RUM without a set back. Then is your action or magwell capable of this much longer cartridge?
NRA Life Member and I vote.

Only accurate rifles are interesting.

Gordy and Brady.
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Unread 05-08-2011, 08:03 AM
Join Date: Mar 2010
Location: on the Southern Plains
Posts: 1,988
Re: 7mm Rem Mag rechamber?

Barrel, 24" long? Ya' really need 26" to get the most of a STW or UM. Factory barrel? It may be just me, but I won't spend the time or money to re-chamber one thats' mine.
"Shoots real good!": definition; it didn't blow-up in my face. 1993 graduate Montgomery Community College 2yr. gunsmithing program
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Unread 05-08-2011, 08:04 AM
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Re: 7mm Rem Mag rechamber?

I'm going with the other post, Why? A 7mm rem mag will run the heavy weights at an appropriate speed, all you stand to gain is 250fps (stw) or 400fps (rum) but in turn you'll be using 15-25grns more powder, your barrel won't survive even half as long and brass is more exspensive and harder to find, not to mention limited to remington and nosler. But if you think you must either can be done but as mentioned both are 3.6"+ length cartridges.
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Unread 05-08-2011, 08:04 AM
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Join Date: Dec 2005
Posts: 2,483
Re: 7mm Rem Mag rechamber?

You probably could, but the chamber reamer may need an oversize pilot. If the 7 Rem Mag barrel's got over 800 rounds through it, the throat may well be enlarged such that an oversize pilot is needed to center the new chamber on the bore..

After this is done, the accuracy probably won't be any better than the original chamber produced. And it'll wear out faster 'cause more powder's burned for each shot.

I'd stick with the original chamber until the barrel's worn out and accuracy's no longer what you want. Then rebarrel to the larger round. I'd check magazine length to be sure the new ammo both fits and feeds reliably from it.
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