It was developed back in the 80s and used a slow twist barrel. Today the 22-243, 22-250 AI and 22 Creedmoor with faster twist barrels have become a more popular design with heavy bullets. Many still use the slower twist with light bullets but heavy bullets with faster barrels have become a favorite recently.Thanks. Makes you wonder why it isn't more popular, now with the interest in small and fast?.?.?.?.
Lapua makes the 308 Palma case with a small primer. I seem to remember Jim Carmichael (Outdoor Life)and Kenny Jarrett collaborating on this cartridge.I supose it is hard to come by the 308 BR cassings. I have seen afew 22-243 and a 22-6mm. They are hard on tubes. You can really push a biger bullet hard and fast.
What reloading dies do you have?I purchased a rifle marked 22 Cheetah .251 NK on barrel , which seems to mean that it is not a Mach1 or a Mach 11
but is closest to a Mach11, any ideas how i could form up ammo to shoot in this fine rifle, Any help will be appreciated.
Thks
Causie
Yes that was the big thing when he developed it was using the smaller primer pocket. Apparently it was much more consistent. At the time Benchrest primers were a fairly new concept. Adaptation of small rifle primers in large cases. I believe the CHeetahs of today are simply the 22/243 improved(40°).L
Lapua makes the 308 Palma case with a small primer. I seem to remember Jim Carmichael (Outdoor Life)and Kenny Jarrett collaborating on this cartridge.
No I guess I meant fairly ( about a decade new) at the time he built his CHeetah.Don't think match primers were new. I was shooting them in 1978. The CHeetah came out after that. I stand corrected Jim and Fred collaborated on this. I was one of the developers of the 30 American case(early 80's) and it had a small primer. Once we got past 35 grs. of powder we didn't see any benefit to the small primer. Get 243 Lapua brass and build a 22-243 of some kind. I've got a Middlested reamer and can't remember the last time I used it.
According to Carmichael, he stated in the article of his CHeetah build, that the large primer ignites much more case powder upon ignition than the small primer does taking away from the charge used to propel the bullet. Too me it seems as tho once the primer ignites the case powder, it's all burning to propel the bullet anyway. Didn't understand his theory exactly concerning the primer ignition and the powder it ignites in the case. The pressure difference I understand.The ability of small rifle primer .308 Win brass (Palma) to handle pressure is far greater than LRP .308 brass. Loads with 185s in LRP brass predicted by QuickLoad to be running somewhere in between 60-61K psi would trash the primer pockets in maybe 4-5 firings. In contrast, the SRP Palma brass can take pressures predicted to be in the neighborhood of 63-64K psi (or higher) for quite a few more firings. I'd imagine that would be a big benefit for a cartridge like the Cheetah.
A bench rest gunsmith built me a 22Cheetah Mk 1 on a Remington 40X action and Hart barrel back in the late 80's. The Hart barrel was a 1 in 16 twist using 52-55 grain bullets. Remington URBR (308) brass with the small primer pocket was used to fire form.Using IMR 4350 powder as a final load and Rem. 71/2 primers , I was constantly blowing primer pockets, even after reducing the load, the leaking primers had damaged the bolt face and I decided to re-chamber it to 220 Swift. I have a set of RCBS dies in 22 Cheetah Mk 1 in case anyone is interested.The ability of small rifle primer .308 Win brass (Palma) to handle pressure is far greater than LRP .308 brass. Loads with 185s in LRP brass predicted by QuickLoad to be running somewhere in between 60-61K psi would trash the primer pockets in maybe 4-5 firings. In contrast, the SRP Palma brass can take pressures predicted to be in the neighborhood of 63-64K psi (or higher) for quite a few more firings. I'd imagine that would be a big benefit for a cartridge like the Cheetah.
His article only tells of his Douglas 1-14 twist barrel used for his Mark I project gun. His testing was done with 50-55 grain bullets. IMR 4064/4350 were the only two powders used in his article. Charges ran from 40-49. Velocities ran from 3700-4285. Barrel was 27". Carmichael was the designer and inventor and Huntington being the founder of RCBS and friend of Carmichael who provided the reloading components. Initially called the .22 Carmichael-Huntington was shortened to .22 CH but turning out as fast as it was, the speediest of it's breed , it became the .22 CHeetah.A bench rest gunsmith built me a 22Cheetah Mk 1 on a Remington 40X action and Hart barrel back in the late 80's. The Hart barrel was a 1 in 16 twist using 52-55 grain bullets. Remington URBR (308) brass with the small primer pocket was used to fire form.Using IMR 4350 powder as a final load and Rem. 71/2 primers , I was constantly blowing primer pockets, even after reducing the load, the leaking primers had damaged the bolt face and I decided to re-chamber it to 220 Swift. I have a set of RCBS dies in 22 Cheetah Mk 1 in case anyone is interested.
I believed the Cheetah idea involved Jim Carmichael (benchrest shooter) and Fred Huntington at RCBS. The 1 in 16 twist was used at the start.
According to Carmichael, he stated in the article of his CHeetah build, that the large primer ignites much more case powder upon ignition than the small primer does taking away from the charge used to propel the bullet. Too me it seems as tho once the primer ignites the case powder, it's all burning to propel the bullet anyway. Didn't understand his theory exactly concerning the primer ignition and the powder it ignites in the case. The pressure difference I understand.
A bench rest gunsmith built me a 22Cheetah Mk 1 on a Remington 40X action and Hart barrel back in the late 80's. The Hart barrel was a 1 in 16 twist using 52-55 grain bullets. Remington URBR (308) brass with the small primer pocket was used to fire form.Using IMR 4350 powder as a final load and Rem. 71/2 primers , I was constantly blowing primer pockets, even after reducing the load, the leaking primers had damaged the bolt face and I decided to re-chamber it to 220 Swift. I have a set of RCBS dies in 22 Cheetah Mk 1 in case anyone is interested.
I believed the Cheetah idea involved Jim Carmichael (benchrest shooter) and Fred Huntington at RCBS. The 1 in 16 twist was used at the start.