243win vs 6mm rem

NosLer

NosLer

New member
im trying to find any reason to go to one or the other, is one slightley easer to shoot tighter grups, case life, barrle life...

thanks
 
Nosler,
You can find .243 ammo a lot eaier than 6mm, The 6mm allows you to take a slight advantage when reloading.
Also the twist on the 6mm will shoot the bigger.243 bullets a little bit better than the .243, as the .243 will probably shoot the smaller bullets a tad bit better.
Barrel and case life should be about the same.
I love my 6mm enough to keep it even though ammo is a little esier to find for a .243.
 
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Nosler,
You can find .243 ammo a lot eaier than 6mm, The 6mm allows you to take a slight advantage when reloading.
Also the twist on the 6mm will shoot the bigger.243 bullets a little bit better than the .243, as the .243 will probably shoot the smaller bullets a tad bit better.
Barrel and case life should be about the same.
I love my 6mm enough to keep it even though ammo is a little esier to find for a .243.



The 6MM really doesn't allow you to take a slight advantage when reloading. It will handle the heavier bullets a little better and the .243 handles the lighter ones more efficiently. But there isn’t enough in either case to really make one caliber more desirable than the other one.

The 6mm will not shot bigger bullets than the .243 with standard factory twist. They both come with a 1 in 9 1/8 in Remington. The only Remington that is chambered in 6MM currently is the 700 VLS. I know of no other manufacturers that currently chamber a rifle in 6MM.

Once fired brass for a 6MM for all intents and purposes is unavailable. However .243 once fired brass is plentiful. If you don’t reload then the .243 is the only game in town because of the greater number of factory loaded rounds for it.

To me unless you find a used 6MM at a bargain price it makes no sense to place that many limitations on yourself by buying a 6MM.

If you load and are looking to go AI then we have another story.
 
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The reason I said a slight advantage is because it holds a slight amount more powder, with a little bit more velocity.

The twist that I am talking about is from the speer reloading manual and it states the .243 to have a 1 in 10" twist and the 6mm to have a 1 in 9" twist.
By the larger bullets I meant that the .243 with a 105 grain bullet the fastest load in the speer book is 2869 fps and the 6mm fastest in 105 grain is 3145 fps, that is a slight advantage in my eyes.


Steve
 
The reason the 6mm wasn't as popular originally was because of its twist rate (1 in 12) which wouldn't work real well with the heavier bullets. The standard for the 243 is 1 in 10 which will shoot the lightweights AND the heavy's. The 6mm is ballistically a little more uniform, which lends ittself to a little better accuracy as well. The vast array of factory ammo as well as reloading components and available factory chamberings, has made the 243 king in the 6mm hunting class. /ubbthreads/images/graemlins/grinning-smiley-003.gif
 
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The reason I said a slight advantage is because it holds a slight amount more powder, with a little bit more velocity.

The twist that I am talking about is from the speer reloading manual and it states the .243 to have a 1 in 10" twist and the 6mm to have a 1 in 9" twist.
By the larger bullets I meant that the .243 with a 105 grain bullet the fastest load in the speer book is 2869 fps and the 6mm fastest in 105 grain is 3145 fps, that is a slight advantage in my eyes.


Steve



I'm looking at my Speer manual 7 and the hottest load it shows for the 105 is 2946? That same manual shows the .243 at 2964 with IMR 4350 42.0 Gr. Knowing this book their loads a on the warm side. All of my other manuals show about the same thing with the leader switching back and forth. There are some newer powders this book doesn't show and your velocity may be a good one. But I own both guns and chronograph them. In real life I don't see that advantage. What powder does that load show?

All Remington I'm aware of come with the 1 in 9 to 1 in 9 1/8 twist. I know Savage made some guns for awhile that came in 1 in 10. They currently have also gone to 1 in 91/8.

My Speer manual also shows a Win model 70 with a 1 in 10 twist.
 
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The biggest reason for going with one over the other is strictly personal preference. There are a few advantages to the 6mm over the 243 but these are mostly based on the longer neck and the slightly (very slightly) larger case capacity. If you don't reload there is no real advantage between them.

Jay Johnson; I don't know where you are getting once fired brass in sporting calibers but it isn't to be found in this area. Virgin brass is very available in both calibers. Ruger is still making the M77 in 6mm.
 
I have owned a 6mm Rem since 1972 in different rifles. My answer is i have all three the 240 Wby , 6mm Rem and the 243 Win and i like all three cal. If you don't handload the 243 Win will make you much happier. The 240 Roy will outperform the 6mm or the 243 and give you a edge on big deer but when it comes to the 6mm and the 243 in the field the diff between the two is not hardley worth the mention . /ubbthreads/images/graemlins/grin.gif
 
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All Remington I'm aware of come with the 1 in 9 to 1 in 9 1/8 twist. I know Savage made some guns for awhile that came in 1 in 10. They currently have also gone to 1 in 91/8.

My Speer manual also shows a Win model 70 with a 1 in 10 twist.





When the 6mm Remington first came out....NOT saying right now....but when they first came out, the barrel twist was 1 in 12. The 243 standard was 1 in 10. I am not talking about current production or custom barrels, I am talking about the factory barrels that originally came on these rifles, and the reason why one was picked over the other INITIALLY when they both came out. I hope this clears up what I was trying to say. Have a nice day.
 
Speer #12,
.243=H4350 is 42.0C with a velocity of 2869.
The 6mm IMR 4831 is 45.0 with a velocity of 3145.
This is also the book I got the twist info from.
Thanks Steve
 
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Jay Johnson; I don't know where you are getting once fired brass in sporting calibers but it isn't to be found in this area. Virgin brass is very available in both calibers. Ruger is still making the M77 in 6mm.



It's available here.

.243 brass
 
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All Remington I'm aware of come with the 1 in 9 to 1 in 9 1/8 twist. I know Savage made some guns for awhile that came in 1 in 10. They currently have also gone to 1 in 91/8.

My Speer manual also shows a Win model 70 with a 1 in 10 twist.





When the 6mm Remington first came out....NOT saying right now....but when they first came out, the barrel twist was 1 in 12. The 243 standard was 1 in 10. I am not talking about current production or custom barrels, I am talking about the factory barrels that originally came on these rifles, and the reason why one was picked over the other INITIALLY when they both came out. I hope this clears up what I was trying to say. Have a nice day.



Yes when what people call the 6MM first came out it was 1 in 12 and was called the Remington .244. So you see the 1 in 12 twist gun was a 244 it was stamped on the barrel not 6MM. There may have been a transition period but every 1 in 12 I've seen has been stamped .244. I was referring to the Remington .243 twist in the above statement.

I would say that the modern standard in .243 is now a 1 in 9 1/8 twist since Winchester looks to be breathing their dieing breath.

244 Remington
 
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I concur /ubbthreads/images/graemlins/grinning-smiley-003.gif I'm still a little mad that I sold my 243 to my buddy to fund my 6mm-06 build. But I took him up north huntin' with me and he shot a 5-pointer with it. Meanwhile, I still have the Ruger #1 243 (that I sold my other buddy)in my safe with a nice Nikon Monarch 4-12x40 on it. So all is still well in 6mm land /ubbthreads/images/graemlins/grin.gif. I considered a 240 Roy but the brass is too pricey, and the 6-06 has an ever so slight (1gr) capacity edge---2MG
 
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