I lucked into a new Obermeyer .243 12 twist contoured blank for not much (<$25). I know the early 6mm/244 Remington used a 12 twist and works fine with bullets 90 gr or less. Is there another ctg. that will work in this twist that might handle 100 gr. Looking to stay with 06 case head and will go on a Mauser action. Thanks in advance.

FWIW, my .244 M722 Remington w/ 1n12" twist will stabilize the Speer semi spitzer 100 grain bullet just fine and is quite accurate. I would go w/ the .244 if I were you. There may be some wildcat that would work, but I don't know much about them.
joe

You could do a 6mm-06. The extra velocity might help to stabilize 100 grain bullets.

Joe,
Thanks. This is the kind of info I am looking for. I bought my first 243 Win. 50 years ago so never messed with the 6mm/244. I don't mind wildcats (happen to have a set of 240 Gibbs dies) and hope some one with experience with the various 6mms can chime in. Good to know the Speers will work. This blank is contoured light and will finsh out at 26" or less so I can take advantage of the length if need be.

Hello, Thaine. What about necking up the .220 Swift? the neck would be a bit short..but you would have a modern equivalent of the old .236 (6mm) Lee-Navy.

If I were doing the build I would make it into a stout barreled varminter chambered in 6mmRem. The slower ROT would be perfect to stabilize 55 grain Nosler BT, 58 grain V-max or the heavier bullets such as the 75 grain NBT. I have a Rem model 600 chambered in this round and shoot the 75's in it. I call it my coyote rifle but have yet to put the smack on a yote with it yet but have shot two whitetail does even though the bullet is on the light end of things. I really like this cartridge.

6x47 (6mm-222 Rem Mag) or 6x204 Ruger are two that come to mind quickly with a 1:12 twist. You should be able to get 70 grain bullets to go around 3200 fps with a 24" barrel. Should run 85 grain bullets with no problems as well. Super light recoil and a pure pleasure to shoot, with plenty of power to cover deer.

Spitzer 100grn bullets do not do too well with the 12" twist.
I would build a varmit rifle or swap it for a tube that has a faster twist. i really like the 6X47 (.222 Rem Mag case or 6X45 -,223 case)

if it weren't for the 06 head i'd suggest a 6mm ppc, but how about the 6br. coming out of one of boots barrels it would be quite a tack driver

Go with the .240 Gibs. roger

You don't need a 100 gr bullet to take on anything you would hunt with a 244 Remington.
The 80 gr TTSX or 85 gr TSX can both be pushed
+- 3400 fps and will kill as well or better than a 100gr conventional bullet. I used the 80 in my 244 H&H @3700 fps. Any regular lead core of that weight would frequently vanish on the way to the butt. Both bullets are deadly killers. If you wanted a wildcat the 244 improved will give you a bit more velocity. The 1 in 12 twist myth was started by a few gun writers (who probably were invited to Olin farms every year). The 244 is a better cartridge than the 243 ..... enjoy it.

quote:

Originally posted by SR4759:
Spitzer 100grn bullets do not do too well with the 12" twist.
I would build a varmit rifle or swap it for a tube that has a faster twist. i really like the 6X47 (.222 Rem Mag case or 6X45 -,223 case)

This may be true, but like I said, the Speer SEMI-Spitzer is very accurate in my .244 w/ 1 - 12 twist, not necessarily yours.
joe

Why are we debating 100 gr bullets ? You don't need a 100 gr bullet for anything you take on with a 244 anymore than you need a 220 gr bullet to kill an Elk with a 300 H&H.
We are not living with unbonded cup and core bullets as our only choice. Modern "wonder" bullets", especially mono metals have changed the rules. It a'int the Condors .... it's performance.

Why wouldnt a 6mm/244 stablize a 100 grainer? For a bore that small I see no reason for any more than a 57mm case. If you want more you could go with an AI version.

My 257 AI will match 25/06 loads all day long.

+1 I have had a 6MM-06 and didn't find it any better in the field than my 6MM AI. The biggest advantage of the really overbore cases is shooting heavy bullets with bulky slow powders. n your case, the heavy bullet option is out for reasons beyond your control.


I've also had a 6BR which was wonderfully accurate but a total bitch to feed through any normal action. Still have and like a 243 Winchester too.

That's a really nice barrel and unless you're of the sort that considers barrels a consumable every 2-3 years, I'd pick something moderate bewteen the 243 Win and 6MM Rem AI. But's that just me.

quote:

Originally posted by 45-70 shooter:
Why are we debating 100 gr bullets ? You don't need a 100 gr bullet for anything you take on with a 244 anymore than you need a 220 gr bullet to kill an Elk with a 300 H&H.
We are not living with unbonded cup and core bullets as our only choice. Modern "wonder" bullets", especially mono metals have changed the rules. It a'int the Condors .... it's performance.

You are correct. There is no need to debate this already been beat to death issue. Most anything from 80 to 90 grains can be loaded to take most game on this continent and then some. 100 grains are not really needed.
joe

quote:

Spitzer 100grn bullets do not do too well with the 12" twist.

That has not been my experience with my .244... It shoots bug holes with the 100-grain Speer flat based spitzers.

Correct me should I be wrong but .244 Rem is 1 in 12, 6mm is 1 in 10, .243 Win also 1 in 10 (factory). Most game won't notice the difference between 90 / 100 grainers, probably the 90 might pack more punch because of higher velocity up to a certain distance - say 300 yds. Having said that the 90 might suffer from lack of penetration but that would depend on the game. JMHO - FWIW --- John303.

I would chamber and mark it as a 244REM in defference to it's twist rate and load 90gr bullets into it.

Nosler makes a partition...

As for Mono-metal bullets? not in the cards they are LONGER and it's the length of a bullet that dictates twist rate.

Last thing I'll add.... don't build a 244REM or a 6mmREM on a short action.

quote:

Originally posted by Doubless:

quote:

Spitzer 100grn bullets do not do too well with the 12" twist.

That has not been my experience with my .244... It shoots bug holes with the 100-grain Speer flat based spitzers.

So you have exactly 1 data point. That does not make a rule for all rifles and all 100 grain bullets.

quote:

Originally posted by Allan DeGroot:
I would chamber and mark it as a 244REM in defference to it's twist rate and load 90gr bullets into it.

Nosler makes a partition...

As for Mono-metal bullets? not in the cards they are LONGER and it's the length of a bullet that dictates twist rate.

Last thing I'll add.... don't build a 244REM or a 6mmREM on a short action.

In theory this is correct but in practice they work fine. The Ruger 77 short action has a little longer magazine than the short Remington. The short Remington can have the mag box lengthened if the middle tapped hole for the ADL trigger guard is removed.

quote:

Originally posted by 45-70 shooter:
Why are we debating 100 gr bullets ? You don't need a 100 gr bullet for anything you take on with a 244 anymore than you need a 220 gr bullet to kill an Elk with a 300 H&H.
We are not living with unbonded cup and core bullets as our only choice. Modern "wonder" bullets", especially mono metals have changed the rules. It a'int the Condors .... it's performance.

I have no interest in the fad wonder bullets.
If I want a 100 grain conventional bullet I will use it. Many here forget that a monolithic bullet is often as long as the next heaviest cup and core bullet.

quote:

So you have exactly 1 data point. That does not make a rule for all rifles and all 100 grain bullets.

A bit sensitive, aren't you? Read my post again... I specifically stated that your generalized statement was not what I experienced in MY rifle.

It appears to me you have overextended yourself. Not the first time...

The barrel is twisted for lighter bullets so why burn the throat out with overbore cartridges. IMO you'll be better served with a smaller case like the ones I mentioned or the 6x45 already mentioned or a BR or PPC as a walking varmint rifle. If your going to run a larger case than that get a barrel twisted to run the heavy bullets.

Thanks to all that replied, I spent quite a bit of time on the web and reading my various references and have come to a simple conclusion. It will wind up being a 26” 6mm/244 Remington. I appreciate everyones input and my logic for the choice follows:
1. I have 3 each 243 Win. A Savage 110L, my Dad’s Sako Forester and an H&R Ultra auto. I have messed with the 243 for 50 years and know what it is capable of.
2. I have a bull barrel 6x47 (222 Mag based) on a Rem 700 action so that base is covered.
3. I thought about various exotics like the Lee Navy, Walker etc, but the pain of forming and cost of dies is not worth it to me. 6mm dies can be had for ~$20-30 or so on evil bay.
4. I thought about the overbore ctgs. But decided against them for one reason. While I may be into this barrel blank for next to nothing, I appreciate the quality of it and want to get as long a life out of it as I can. Not that I would probably ever shoot it out anyway.
5. Since I have extra Mauser actions in the project pile, the ease of barreling and having reliable feeding plays a major part.
6. The barrel is Boot’s D-3 contour and is .625 at the 24” point so no heavy barrel. At 26” I have the ability to shorten it if I need too; hard to add on. I also have the ability to set it back and rechamber to one of the overbore cases like the Gibbs (my dies turned out to be 25 Gibbs) if I decide WTH.
It will be a coyote rifle, since a large part of the country I hunt is open, windy and lacks those green things called trees. With good bullets, it will double for antelope or deer. I really appreciate the information shared by everyone, sorry if I started a minor pissing contest, but really appreciated everyones input. I had hoped that the larger cases, might overcome the “theoretical” twist problem, but with bullet technology going the way it is, I think I will just enjoy it for what it should be. Hopefully a sweet 6 that blows big holes in furry critters that no one wants, yet can handle the job on something larger if needed.

I don't know if you know that the .244 Rem & 6mm Rem are the same case, it's the twist that is the difference in the nomenclature. The correct term for your 1 in 12 would be .244 Rem. --- John303.

Actually remington changed the twist from 1-12 to 1-9 before they changed the name from 244 to 6mm. Layne Simpson wrote in Shooting Times many years ago about owning a 244 labeled gun with a 1-9 twist barrel.

I understand it that you got a cheap barrel and want to use it. I think with the 1-12 twist you'll have a hard time beating the .243's you already have. Maybe make a plinker out of it and shoot cast bullets only??

Another vote for 6mm/244 Rem. The 243 Win is a great round, but I am not into ubiquity - I like to be different and I like classic cartridges.

Max it!!. .240 Wea. Magnum.

You might want to consider selling it . My gunsmith tells me custom barrel makers are currently 6 months behind.

My vote is to chamber it to any cartridge which takes your fancy, then go out and shoot it until it is about a 20-gauge smooth-bore!!