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#2301837 - 07/09/08 08:22 PM Re: Rechambering a .243 to 6mm [Re: CrimsonTide]
DoubleRadius Offline
Campfire Regular

Registered: 06/22/08
Posts: 255
Loc: Texas y'all
 Quote:
This may be a completely silly question....is the difference in twist a problem?


Both cartridges can use the same twist rate, and if you want to use the 95 Partition then you'll need a 1:10" minimum. The .244 Remington (predecessor to the 6mm Remington) used a 1:12" twist and the longer 6mm bullets were marginally stable.

You'll have to set the barrel back quite a bit to clean up the chamber, this is not a "one thread" job. The 6mm-.284 is not a good candidate for a pure rechamber since at least part of the original throat of the .243 will still be there. I'd set it back ~4.5 threads if it were me. The half-thread part puts the barrel stamping under the forearm - a nice custom touch that costs nothing.


.

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#2302112 - 07/10/08 03:26 AM Re: Rechambering a .243 to 6mm [Re: CrimsonTide]
roper Offline
Campfire Regular

Registered: 08/11/05
Posts: 399
If you did the 6Rem/243AI you have to set the barrel back not sure about doing a 6/284 other choice would be a 6RemAI and you could do that without setting the barrel back.

Well good luck
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#2304323 - 07/11/08 07:03 AM Re: Rechambering a .243 to 6mm [Re: roper]
safariman Offline
Campfire Oracle

Registered: 06/18/05
Posts: 26209
Loc: All over the place! missing Af...
I have had a couple of 6mm's on short actions and they work great. Not sure where the idea comes from that a long or medium action is needed. A 6mm AI would be a great fit as would a 6mm/284 which I have had some play time with and really enjoyed. You do get meaningful performance upgrades going to either of the three and I agree completely that having something different is a lot of fun.
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#2304474 - 07/11/08 08:37 AM Re: Rechambering a .243 to 6mm [Re: safariman]
himmelrr Offline
Campfire Guide

Registered: 11/19/05
Posts: 4038
Loc: NW Georgia
I've used a 243 somewhat and I bought my son a 6mmREM in a REM 600. No problem with any bullets as far as action length. I'd stay away from the 284 based cartidges as I would be leary of having to open up the rails. Either AI version would be wonderful especially a 6mmAI. You may want to go 243AI since you already have brass you could form.

It sounds like a fun project.

RH
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#2304538 - 07/11/08 09:13 AM Re: Rechambering a .243 to 6mm [Re: himmelrr]
260Remguy Offline
Campfire Kahuna

Registered: 12/18/02
Posts: 15633
Loc: NE
Oddly enough, I've done 15+/- rebarrel or rechamber jobs to the 284 or 284 based wildcats on Remington 7, 600, 660, 700, and 722 actions without ever having to touch the guide rails. Just another proof that I live a charmed life!

Jeff

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#2304550 - 07/11/08 09:20 AM Re: Rechambering a .243 to 6mm [Re: 260Remguy]
JPro Offline
Campfire Outfitter

Registered: 12/13/04
Posts: 9659
Loc: Northern Louisiana
My 700 did not need any rail work, although I swapped to a SAUM follower. Feeds all 3 from the mag very well.
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#2304589 - 07/11/08 09:47 AM Re: Rechambering a .243 to 6mm [Re: JPro]
bassetman Offline
Campfire Regular

Registered: 12/29/06
Posts: 341
Loc: WI
I have two factory 6mm Rems in short action 700's. My only complaint about being short action is that I cannot seat my bullets remotely close to the lands and still fit them in the magazine....but that's Remington's fault for too long of a throat, not that they are short action.

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#2304764 - 07/11/08 11:09 AM Re: Rechambering a .243 to 6mm [Re: bassetman]
JPro Offline
Campfire Outfitter

Registered: 12/13/04
Posts: 9659
Loc: Northern Louisiana
Just be glad its not a .30cal. You would need an H&H-length action to touch the lands if Remington chambered the barrel. Who knows what that is all about. Also have a 700 in 270win with a stupid-long throat. It takes 150's seated way out to touch the lands.

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#2304932 - 07/11/08 12:25 PM Re: Rechambering a .243 to 6mm [Re: 260Remguy]
FVA Offline
Campfire Tracker

Registered: 08/18/02
Posts: 7243
Loc: NY
 Originally Posted By: 260Remguy
Oddly enough, I've done 15+/- rebarrel or rechamber jobs to the 284 or 284 based wildcats on Remington 7, 600, 660, 700, and 722 actions without ever having to touch the guide rails. Just another proof that I live a charmed life!

Jeff


I had a 25-284 that fed smooth and flawlessly that started life as a Remington 700, 6mm. In my case I'm not so sure of the charmed life thing though.
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#2305788 - 07/11/08 07:24 PM Re: Rechambering a .243 to 6mm [Re: JPro]
safariman Offline
Campfire Oracle

Registered: 06/18/05
Posts: 26209
Loc: All over the place! missing Af...
 Originally Posted By: JPro
Just be glad its not a .30cal. You would need an H&H-length action to touch the lands if Remington chambered the barrel. Who knows what that is all about. Also have a 700 in 270win with a stupid-long throat. It takes 150's seated way out to touch the lands.



It is called product liability and low pressures. The lawyers have been running Remington for a long time. See 8mm Rem MAg for most obvious proof. Totally took its balls away and doomed it to failure. Long throats are hard to overload for with any book spec load.
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LOVE God, LOVE your family, LOVE your country, LIKE guns and sports.

About 2016 team "R" candidates "We definitely need a crew with a sack of balls the size of hot water bottles, bloviated estrogen leaking feel-gooders need not apply." Gunner 500

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