I was just wondering if there is a round that is a necked down 243 Winchester case to 22 Caliber.Thanks in advance.

Yes, there are several versions. 22 CHeetah Mk I & Mk II, 22-243, 22-243 Middlestead among others.

from what i understand both the 6mm rem and the 243 win have both been necked to .22 cal...what they call either of them besides 22/243 or 22/6mm rem i don't know.

[ 12-24-2002, 08:19: Message edited by: Curtis_Lemay ]

The 6mm Remington necked to 22 caliber is called the .224 TTH, for Texas Trophy Hunter.

Reportedly, one of the majors is getting ready to "canonize" the .224 TTH, but whether they'll refer to it as the .224 TTH is unknown.

The .224 TTH is a really wicked cartridge. The barrels are 1:8 twist, and they'll launch the 75 grain Hornady AMAX at around 3400 fps. Point blank range is supposed to rival most heavy magnums, and it's supposedly an excellent light deer cartridge with the heavy partitions and their ilk.

Dan

I have a 22-243 Middlestead, it's a great gopher gun. With a 27" barrel, 4000 fps with 50 gr bullets isn't a problem, and forming cases is simple. Ballistically speaking, I don't think there is a whiskers differance between the 22-243 Middlestead or the two Cheetahs. - Dan

I've heard the 22-243 can be tempermental. A guy who owned one said it heated up pretty quick and it didn't take much (like haveing a round in a warm chamber) to make pressure signs.

I don't know why but nosler says the .243 55 grain bt they make has as good or better ballistic coefficient as a 55 grain .22 bullet.
I've seen my friends ruger varmiter in .243 with 26" barrel push 4050fps with great accuracy.
I realize you might get a little better wind bucking out of a long .22 caliber bullet but don't think it would be worth the troubles of necking the .243 down.

To me the 22-243 had merit years ago before the new bullets came along making the regular .243 a rocket ship. If I remember right a 70 grain BT out of a .243 will easily go 3650 fps out of my personal .243 varmiter.

If there was one it would come mighty close to the 22-250 Remington. That's probably why there hasn't been one. The 22-250 case is only .13 shorter than the 243 and .030 narrower at the shoulder. Same rim size.

The .22-6mm Rem was wildcatted long before somebody decided to take credit for it with the name TTH. The .22-6mm and the .22-243 are no more temperamental than any other overbore cartridge. It always amazes me how someone can look at one rifle chambered for a specific cartridge and become an automatic expert on that cartridge. That is one gun and some of the things you see with it just might be idiosyncratic of that particular rifle not the cartridge. A .22 caliber 55 grain bullet pushed at the same speed as a 6mm 55 grain bullet is going to shoot flatter if the bullets are of the same style of constuction. No matter what Nosler says.

My gunsmith has these 22-243middlesteads. He likes them. He has 1 in 7 twist and says he shoots 109gr bullets. But I never see these bullets for sale. You guys?

Don't want to start a "peeing match" but I posted about this round on another forum a shortwhile back. SEVERAL guys said they owned the 22-243 and after short barrel life had them rebarreled back to other rounds and were glad to be out of it. Basically for the reaons stated above: lack of improvement in speed over 22-250, finicky accuracy, faster heat up of the barrel for dog shooting, fast throat erosion.

I have a 22-243AI. There is nothing new about either the 22-6mm or the 22-243. I have not found this cartridge dificult to shoot well.
The 22-243 is waaaaaaaaaaay better than the 22-250 if you like shooting high BC bullets. JLK 80gr bullets have a BC of .525 and can easily shoot at 3,500 ft/sec from my rifle. Hornady 75gr A-MAX bullets are very accurate when shot at 3,668 ft/sec and terminal performance on grounhogs has to be seen to be believed, even at extended range. Try that with a 22-250.
So far, I have not had any problems with throat erosion. The key here, like all overbored cartridges, is to NOT over heat the barrel. My Hart #7 contour does not heat all that fast, but when it gets warm I set it aside and shoot another rifle until the 22-243AI is completely cool. This is no problem when shooting groundhogs. I would not recommend a 22-243 for PD's were the action can be fast and furious.
VH

The 224 TTH is just another version of the 224 Clark (aka 22-257), which has been around since the early sixties. Twist was 9" and it used 80gr bullets in front of 51-53 grs of H450. I have wanted to put a rifle together for this round, but it seems way overbore and I would think barrel life would be short. Anybody had any experience with this round?

I have 22 satisfied customers shooting a 22/243 Middlested, barrel life has varied from less than 1000 rounds(Prairie dogs, no self control) to over 2500 rounds and still going. I think they will need a new barrel around 3000. If you are a serious coyote hunter and want to use a 22CF, a 22/243 will fit the need.