I have an old Speer manual #10, and they do show reduced loads for SR4759 in the .222 and .222 magnum (strangely enough, not for the .223). My copies of Ken Waters Pet Loads are packed away somewhere, but IIRC he described some as well.

Ken Howell's book Designing and Forming Custom Cartridges describes a wildcat named the ".22 Flea" which is a .32 ACP necked to .22 Caliber grin Holds 13 grains of water, versus a .22 Hornet's 21.

I guess one could neck a .25 ACP to .22, as well grin

Last edited by tex_n_cal; 04/14/14. Reason: fixed
"...the designer of the .270 Ingwe cartridge!..."