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any solid published data on the 22-243win??

Hodgdon online reloading data has the 220 Jaybird that is a slightly improved version that should get you started without issues
 
The older Hodgdons book had the 22 CHeetah. Now if I could find it...

But from Wikipedia:
The .22 CHeetah (both C and H are upper-case,referring to Carmichel / Huntington is a .22 wildcat cartridge developed in the 1970s or 1980s by Jim Carmichel and Fred Huntington.

The .22 CHeetah is essentially a Remington .308 BR (empty .308 Winchester casesmodified to fit the .22 caliber.Two custom gunmakers, Shilen Rifle Company and Wichita Engineering, made rifles specifically for the cartridge The cartridge's 50-grain .22-caliber bullets have a muzzle speed upward of 4,300 ft/s (4,250 according to some< and the cartridge is known for its long-range accuracy and velocity Its high intensity is notoriously hard on barrels, which require constant cleaning.
 
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Search this site. Lots of data for 22-243, 22 Middlestead and 224 Cheetah.
Good luck,
Aaron
 
Actual data is sparse, but some articles about the 22-243 are...
Handloader #124-p.9 or Wolfe Pub. Wildcat Cartridges Vol. 1-p.26 (same article I think)
Wolfe Pub. Wildcat Cartridges Vol. 2-p.141-much older article... mentions RL21 & H205.
Best of Precision Shooting Vol.2-p.121-125
Could have sworn it was in the Ackley books, but not seeing it tonight.

CHeetah- Handloader #124-p.12; Handloader #142-p.6; Handloader #147-p.12
CHeetah Mk.2-Hodgdon #26-p.139; Handloader #129-p22
 

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