Previous Thread
Next Thread
Print Thread
#2300212 - 07/09/08 Rechambering a .243 to 6mm  
Joined: Nov 2004
Posts: 19,315
CrimsonTide Offline
Campfire Kahuna
CrimsonTide  Offline
Campfire Kahuna

Joined: Nov 2004
Posts: 19,315
Kentucky
This may be a completely silly question, but if a man had a .243 and would rather it be a 6mm, is it as simple as running a chamber reamer in it, or is the difference in twist a problem?

I understand this is a low speed custom question, so I appreciate your indulgence.
CT


"The number one problem with America is, a whole lot of people need shot, and nobody is shooting them."
-Master Chief Hershel Davis

AIH 300 L
#2300248 - 07/09/08 Re: Rechambering a .243 to 6mm [Re: CrimsonTide]  
Joined: Jun 2004
Posts: 27,201
mathman Online content
Campfire Oracle
mathman  Online Content
Campfire Oracle

Joined: Jun 2004
Posts: 27,201
Twist isn't a problem, but the difference in taper of the case bodies probably is.

#2300276 - 07/09/08 Re: Rechambering a .243 to 6mm [Re: mathman]  
Joined: Nov 2004
Posts: 19,315
CrimsonTide Offline
Campfire Kahuna
CrimsonTide  Offline
Campfire Kahuna

Joined: Nov 2004
Posts: 19,315
Kentucky
I see, so you would end up having to set back and rechamber.


"The number one problem with America is, a whole lot of people need shot, and nobody is shooting them."
-Master Chief Hershel Davis

#2300278 - 07/09/08 Re: Rechambering a .243 to 6mm [Re: mathman]  
Joined: Apr 2006
Posts: 4,121
horse1 Offline
Campfire Guide
horse1  Offline
Campfire Guide

Joined: Apr 2006
Posts: 4,121
In the vicinity of dandihood
Why wouldn't you go 243AI instead? The 6 can be a bastard in a short action, mag constraints being your main concern.


I can walk on water.......................but I do stagger a bit on alcohol.
#2300363 - 07/09/08 Re: Rechambering a .243 to 6mm [Re: horse1]  
Joined: Nov 2004
Posts: 19,315
CrimsonTide Offline
Campfire Kahuna
CrimsonTide  Offline
Campfire Kahuna

Joined: Nov 2004
Posts: 19,315
Kentucky
All I want to do is shoot 70 grain blitzkings and 95 grain partitions, I can't imagine that it would be a problem to run them out of a short action. I could forsee it if I wanted to shoot long matchking pills, or something like that.

I have been down the ackley road, and if I were to get squirrelly with a re-chamber it would probably be to a 6mm-284.


"The number one problem with America is, a whole lot of people need shot, and nobody is shooting them."
-Master Chief Hershel Davis

#2300802 - 07/09/08 Re: Rechambering a .243 to 6mm [Re: CrimsonTide]  
Joined: Dec 2002
Posts: 21,989
260Remguy Offline
Campfire Kahuna
260Remguy  Offline
Campfire Kahuna

Joined: Dec 2002
Posts: 21,989
NE
You would have to set the barrel back, as the 6mm case has more tapper from the base to the bottom of the shoulder than the 243 does. A 6-284 reamer would clean out the 243 chamber without setting back the barrel and would show a significant velocity gain with bullets in the 70 to 95 grain range. If you don't over-heat it, it might even last for 8,000+/- rounds.

Jeff

#2300872 - 07/09/08 Re: Rechambering a .243 to 6mm [Re: 260Remguy]  
Joined: May 2002
Posts: 2,091
erich Online content
Campfire Ranger
erich  Online Content
Campfire Ranger

Joined: May 2002
Posts: 2,091
wash. state
Those two bullets should shoot just fine out of a standard 243 Win.

erich


After the first shot the rest are just noise.
#2301034 - 07/09/08 Re: Rechambering a .243 to 6mm [Re: erich]  
Joined: May 2007
Posts: 5,057
crittergetter Offline
Campfire Tracker
crittergetter  Offline
Campfire Tracker

Joined: May 2007
Posts: 5,057
Dallas,TX
I had a 6mm-270 Winchester built last year,it's 1 of the most accurate rifles I own,I'm using 105 gr. Hornady AMAX'S and they worked great on deer and hogs last year.

#2301551 - 07/09/08 Re: Rechambering a .243 to 6mm [Re: crittergetter]  
Joined: Nov 2004
Posts: 19,315
CrimsonTide Offline
Campfire Kahuna
CrimsonTide  Offline
Campfire Kahuna

Joined: Nov 2004
Posts: 19,315
Kentucky
Those two bullets do shoot just fine out of a .243, but they are beginning to be the strawberry ice cream in a gallon of neopolitan. (With a .30-06 being vanilla and a .270 being chocolate)

I just hate having the same thing everybody else has...Its a terrible sickness.


"The number one problem with America is, a whole lot of people need shot, and nobody is shooting them."
-Master Chief Hershel Davis

#2301777 - 07/09/08 Re: Rechambering a .243 to 6mm [Re: CrimsonTide]  
Joined: Aug 2007
Posts: 872
Sinman6 Offline
Campfire Regular
Happy Birthday Sinman6  Offline
Campfire Regular

Joined: Aug 2007
Posts: 872
watertown, SD
Id say do it on a long action for the 6mm or 243ai for the short.

#2301837 - 07/09/08 Re: Rechambering a .243 to 6mm [Re: CrimsonTide]  
Joined: Jun 2008
Posts: 280
DoubleRadius Offline
Campfire Regular
DoubleRadius  Offline
Campfire Regular

Joined: Jun 2008
Posts: 280
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.


.

#2302112 - 07/10/08 Re: Rechambering a .243 to 6mm [Re: CrimsonTide]  
Joined: Aug 2005
Posts: 414
roper Offline
Campfire Regular
roper  Offline
Campfire Regular

Joined: Aug 2005
Posts: 414
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


USMC
Life Member VFW
#2304323 - 07/11/08 Re: Rechambering a .243 to 6mm [Re: roper]  
Joined: Jun 2005
Posts: 27,493
safariman Offline
Campfire Oracle
safariman  Offline
Campfire Oracle

Joined: Jun 2005
Posts: 27,493
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.


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
#2304474 - 07/11/08 Re: Rechambering a .243 to 6mm [Re: safariman]  
Joined: Nov 2005
Posts: 4,083
himmelrr Offline
Campfire Guide
himmelrr  Offline
Campfire Guide

Joined: Nov 2005
Posts: 4,083
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


[Linked Image]
#2304538 - 07/11/08 Re: Rechambering a .243 to 6mm [Re: himmelrr]  
Joined: Dec 2002
Posts: 21,989
260Remguy Offline
Campfire Kahuna
260Remguy  Offline
Campfire Kahuna

Joined: Dec 2002
Posts: 21,989
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

#2304550 - 07/11/08 Re: Rechambering a .243 to 6mm [Re: 260Remguy]  
Joined: Dec 2004
Posts: 11,006
JPro Offline
Campfire 'Bwana
JPro  Offline
Campfire 'Bwana

Joined: Dec 2004
Posts: 11,006
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.


I cannot spell, just so you know.....
#2304589 - 07/11/08 Re: Rechambering a .243 to 6mm [Re: JPro]  
Joined: Dec 2006
Posts: 342
bassetman Offline
Campfire Regular
bassetman  Offline
Campfire Regular

Joined: Dec 2006
Posts: 342
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.

#2304764 - 07/11/08 Re: Rechambering a .243 to 6mm [Re: bassetman]  
Joined: Dec 2004
Posts: 11,006
JPro Offline
Campfire 'Bwana
JPro  Offline
Campfire 'Bwana

Joined: Dec 2004
Posts: 11,006
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.

[Linked Image]


I cannot spell, just so you know.....
#2304932 - 07/11/08 Re: Rechambering a .243 to 6mm [Re: 260Remguy]  
Joined: Aug 2002
Posts: 7,419
FVA Offline
Campfire Tracker
FVA  Offline
Campfire Tracker

Joined: Aug 2002
Posts: 7,419
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.


#2305788 - 07/11/08 Re: Rechambering a .243 to 6mm [Re: JPro]  
Joined: Jun 2005
Posts: 27,493
safariman Offline
Campfire Oracle
safariman  Offline
Campfire Oracle

Joined: Jun 2005
Posts: 27,493
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.

[Linked Image]


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.


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
#2307798 - 07/12/08 Re: Rechambering a .243 to 6mm [Re: safariman]  
Joined: Mar 2005
Posts: 14,840
dogcatcher223 Offline
Campfire 'Bwana
dogcatcher223  Offline
Campfire 'Bwana

Joined: Mar 2005
Posts: 14,840
Kolorado
I think touching the lands is overrated anyway. Lots of accurate guns have long throats.


From a place you will not see, comes a sound you will not hear.
#2308122 - 07/13/08 Re: Rechambering a .243 to 6mm [Re: dogcatcher223]  
Joined: Dec 2004
Posts: 11,006
JPro Offline
Campfire 'Bwana
JPro  Offline
Campfire 'Bwana

Joined: Dec 2004
Posts: 11,006
Northern Louisiana
I agree with your second sentence, but I like having the option of hitting lands.


I cannot spell, just so you know.....

Moderated by  RickBin, SYSOP 

AIH 160 1
Who's Online Now
482 registered members (1beaver_shooter, 204guy, 007FJ, 1234, 300jimmy, 18sgd99, 52 invisible), 1,338 guests, and 525 spiders.
Key: Admin, Global Mod, Mod









Copyright © 2000-2017 24hourcampfire.com, Inc. All Rights Reserved.
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.072s Queries: 14 (0.003s) Memory: 1.0376 MB (Peak: 1.3468 MB) Zlib enabled. Server Time: 2017-09-21 15:52:30 UTC