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Old 11-07-2009, 05:43 PM   #1
dswaim
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Default 6mm vs. .243

Is there a difference between a 6mm and a .243? I was recently told that a 6mm would shoot a .243 shell...
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Old 11-07-2009, 05:51 PM   #2
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the .243 is 6.17 mm so actualy just a shade larger using a unit converter, but I have herd that a .243 is a 6mm.

Just be safe and only shoot ammo that is designated for the gun you are shooting, no reason to kill yourself just on a hunch.
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Old 11-07-2009, 05:54 PM   #3
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They shoot the same bullet. 243 is a winchester round while the 6mm is Remington. The typical twist in a 243 was designed for 85 gr bullets. 6mm barrels had twists that were better for 100 gr bullets.
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Old 11-07-2009, 05:55 PM   #4
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I believe that the bullet diameter is basically the same, but the cartridge is different. A .243 cartridge is actually a .308 cartridge necked down to accept a .243 bullet.

A 6mm will shoot .243 ammo, but a .243 will not shoot a 6mm ammo.

Last edited by StevenW; 11-07-2009 at 05:57 PM..
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Old 11-07-2009, 05:55 PM   #5
Bily Lovec
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ballistically they are the same. dimensionally, they are different.
do NOT try to interchange the ammo.
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Old 11-07-2009, 05:58 PM   #6
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Quote:
Originally Posted by bily lovec View Post
ballistically they are the same. Dimensionally, they are different.
Do not try to interchange the ammo.
fact!
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Old 11-07-2009, 06:15 PM   #7
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Thanks... That is what I was thinking... I asked my wife to stop and pick a box of 6mm up, and the guy at Sports Authority in Humble tried to sell her a box of .243...
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Old 11-07-2009, 06:17 PM   #8
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Quote:
Originally Posted by Bily Lovec View Post
ballistically they are the same. dimensionally, they are different.
do NOT try to interchange the ammo.
what he said!
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Old 11-07-2009, 06:22 PM   #9
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Quote:
Originally Posted by dswaim View Post
Thanks... That is what I was thinking... I asked my wife to stop and pick a box of 6mm up, and the guy at Sports Authority in Humble tried to sell her a box of .243...
The bullets are the same diameter but they are different. A .222 and a .223 and a .22-250 all shoot a .224 diameter bullet but I wouldn't put a .223 or .222 into a .22-250 chamber! Same with the 6mm and .243.
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Old 11-07-2009, 06:54 PM   #10
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a 6mm is a 244 i would not mix the ammo
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Old 11-07-2009, 07:49 PM   #11
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guy at Sports Authority needs the sh... urrr ...uhhh... snot slapped out of him! idiot!
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Old 11-07-2009, 07:57 PM   #12
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243Win==necked down 308Win

6mmRem==necked down 7x57

They are NOT intherchangable. A rifle chambered in one will not safely fire the other. In fact, I don't think the shoulder dimensions will allow you to fully chamber either in the other.

The twist rates were different when the 6mm was introduced at the 244Rem. When the 243Win started proving more popular because it could handle the heavier bullets, Remington changed the standard twist allowing it to stabilize heavier bullets. Now I believe the factory offerings have the same twist and are virtually interchangeable. They both shoot the exact same diameter bullet.
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Old 11-07-2009, 08:01 PM   #13
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They are totally different. Do not mix or try to shoot a 6mm in a 243.

The casings are not the same.The neck on the 6mm is longer than the 243.
And yes a 6mm is a 244 When you reload, you still buy the same diameter bullet for both. Please , please don't do it. The counter help has been known to not know what they are talking about.
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Old 11-07-2009, 08:21 PM   #14
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Quote:
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Now I believe the factory offerings have the same twist and are virtually interchangeable. They both shoot the exact same diameter bullet.
I should clarify that the PERFORMANCE is virtually interchangeable...they throw the exact same bullet at very close to the same velocities.
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Old 11-07-2009, 08:58 PM   #15
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Quote:
Originally Posted by CDH View Post
243Win==necked down 308Win

6mmRem==necked down 7x57

They are NOT intherchangable. A rifle chambered in one will not safely fire the other. In fact, I don't think the shoulder dimensions will allow you to fully chamber either in the other.

The twist rates were different when the 6mm was introduced at the 244Rem. When the 243Win started proving more popular because it could handle the heavier bullets, Remington changed the standard twist allowing it to stabilize heavier bullets. Now I believe the factory offerings have the same twist and are virtually interchangeable. They both shoot the exact same diameter bullet.

X2. The .243 is more versital 58 grain-105 gr. 6MM 80 grain- 105 gr. in my loading manual They will both do a superb job. It will probably be easyer to find 243 ammo anywhere you go than 6MM .
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Old 11-07-2009, 09:03 PM   #16
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Quote:
Originally Posted by rar15usa1 View Post
will probably be easyer to find 243 ammo anywhere you go than 6MM .
Yea no one has any 6 mm ammo
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Old 11-07-2009, 09:49 PM   #17
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6mm or .244 Remington is virtually dead as a factory loaded round, very hard to find being sold retail under ideal circumstances, .243 Winchester is widely available. The .244/6mm Remington is now primarily a handloader's cartridge, much like the .257 Roberts and 7mm Mauser, which all are based on the parent 7mm Mauser casing. The .244/6mm case offers slightly less than 10% greater internal capacity than the .243, so handloaders can squeeze a tad bit more performance out of the older cartridge. In factory loaded form, the offer virtually identical ballistics.

Stu
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Old 11-07-2009, 09:57 PM   #18
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Quote:
Originally Posted by dswaim View Post
Yea no one has any 6 mm ammo
It won't do you any good today, but Cabela's or any online supplier have quite a bit and selections to pick from. You can have it by NEXT weekend.
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Old 11-07-2009, 10:19 PM   #19
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I shoot a 6mm. It is a HCR custom. I chose the 6 over 243 because I am a reloader and the bigger case and longer neck of the 6mm gives you more flexibility when reloading. You can get some really smokin fast loads. I reload anywhere from 55 gr to 100 gr bullets. It is an awsome rifle for varmints and deer. If you don't hand load you do not have near the the choice when purchasing factory ammo. Horniday does make some good 6m stuff.
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Old 11-07-2009, 10:31 PM   #20
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Quote:
Originally Posted by Cottonfish View Post
6mm or .244 Remington is virtually dead as a factory loaded round, very hard to find being sold retail under ideal circumstances, .243 Winchester is widely available. The .244/6mm Remington is now primarily a handloader's cartridge, much like the .257 Roberts and 7mm Mauser, which all are based on the parent 7mm Mauser casing. The .244/6mm case offers slightly less than 10% greater internal capacity than the .243, so handloaders can squeeze a tad bit more performance out of the older cartridge. In factory loaded form, the offer virtually identical ballistics.

Stu
I like to work with cases that have longer necks. That is a big reason I love the 6. I can get alot of reloads out of the same case. My 70 grain hand load is so fast and accurate it is my favorite thing to shoot. It's scarry
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Old 11-07-2009, 10:36 PM   #21
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Quote:
Originally Posted by Boomerang View Post
It won't do you any good today, but Cabela's or any online supplier have quite a bit and selections to pick from. You can have it by NEXT weekend.
Yea I'm not really going to need it for a couple of weeks, but was wanting to go ahead and shoot a few rounds the next few weeks until then....
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Old 11-08-2009, 12:13 AM   #22
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6mm is a bit better balistically than .243, but us Americans are too metric phobic, so the .243 gained popularity 0and the 6mm is a hard gun and round to find.
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