244 Remington ?

The 244 Remington and the 6mm Remington are the same cartridge

The rifles marked 244 have a slower rate of twist ( I think it's 1:12) and sometimes aren't as accurate with heavier bullets

The name was changed shortly after it's introduction, partly due to confusion with the 243, and afterwards the rate of twist was changed to 1:9 to accomodate more popular bullets up to 105 grs

http://en.wikipedia.org/wiki/.244_Remington
 
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Depends on your definition of available. The current shortage has really limited choices for 6mm Remington. With the older, slower twist you may be disappointed with what's usually found on the shelf...100 gr. deer loads.
 
Missed it by "that much"....

While Remington has had a number of smashing commercial successes since WWII, they have also produced a number of quite good cartridges that failed to catch on with the public, once the newness wore off.

Some of these are now essentially dead, and the rest are generally living in retirement homes, along with the majority of us who bought them. ;)

As usual, Wiki gets it mostly right. But leaves out details that actually explain important matters.

While both the .243Win and .244 Rem were introduced in 1955, I believe the Winchester round got to the market first. American gunwriters, most notably Warren Page touted the .243/6mm bore size (and the .243 Win) as the ideal dual purpose round, varmints and deer in one package. And, it is a good round for that.

Winchester rifles were given a twist rate that would work well with both the light varmint bullets AND the 100/105gr "deer" bullets.

Remington envisioned the round as a varmint caliber (seriously mis-reading the market), and built varmint rifles, giving them a twist rate excellent for the lighter varmint bullets, but marginal for the longer, heavier deer bullets.

When the word got around that the .244s wouldn'd group worth spit, with deer loads, the buying public, who had been taught they wanted a dual purpose round (the .243) took a pass on the .244. Sales (never big) slumped.

Later, Remington changed the twist rate of the .244, but it never regained any popularity, the "word" was out about it, and buyers still mostly passed.
(I have heard conflicting versions about the change in the twist, some say Remington did it after a couple years production, and others say it took Rem 6 years to get around to it, changing the twist only a couple years before ending production of the .244 in favor of the 6mm.

The 6mm Remington IS the .244. Cases are the same, except for the headstamp. Rifles are the same, except for the markings and the twist rate (and there are .244s with the faster twist).

Handloaders know they can get about 100fps more from the larger .244/6mm case than they can from the .243 Win. This makes a noticeable difference shooting varmints, with rifles built for the purpose. Put both .243 & .244/6mm in a carbine size deer rifle and the difference becomes mostly moot.

The .243 was the gunwriter's darling, got an early lead in sales, took a huge jump when it turned out the .244s shot poorly with deer ammo, and stayed there, ever since. Remington renaming the round 6mm (1963) has kept it alive, but it never has done as well as other calibers. 6mm fans are loyal, and so there are still 6mm rifles and ammo, but not many, while everybody and their Uncle Max builds and sells a .243 Win.
 
As Jim suggested, you can measure it for yourself with a snug fitting patch on a cleaning rod. Put a mark on it and measure how far it goes in while making one full revolution.
 
You could measure it for yourself

This:

remove the bolt and put a patch on an appropriate sized jag, and start it into the bore from the breech. Once it starts turning as you push it, mark the rod at the breech with a sharpie, and at the 12 o'clock position at the end of the rod. Push the rod into the bore and watch your 12 o'clock mark- when it makes one complete turn back to 12 o'clock, mark the rod again at the breech again as before. Push the rod till the jag comes out the muzzle, remove patch and take the rod out of the bore. Measure the distance between the two "breech" marks. Your rod turned one revoloution in that number of inches. The barrel has that twist rate.

Simple, right?
 
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