.22 Super Jet

[Handgun'r]

Hey Guys,

Just thought I'd check and see if anyone had any "dusty data" tucked away for the old .22 Super Jet, (aka .22 Cotterman Jet, named after Dan Cotterman-gun writer, who created the wildcat back in the mid-60"s) The cartridge is basically a .256 Win Mag necked down to .22 caliber...with some slight variations in shoulder angle, etc. It was initially formed by fireforming .22 Rem Jet brass in a .22 Super Jet chamber.....similar in shape to the .256.
It's ballistically very close to the .221FB, (approx. 8% less case capacity), and (as listed by Ackley) runs 45-50gr. bullets up around 3200-3300fps.
It can be easily made from .357 Magnum brass, which I have a ton of, and it's a rimmed case which lends itself to the single action guns much better, thus the reason for making it.

Based on thoughts of the efficiency of the .22PPC, and other fat "shorty cases", it appears to be a good one for the powders and weights used.

As mentioned, I've got some data from Ackley, which was available on the internet, but for the most part, their isn't much else on it anywhere.
I'm currently having a 20" carbine barrel chambered for it now to go on my Encore for fox & coyotes.
Nothing wrong with the Ackley data, but I know he liked to push the envelope a little and was optimistic on pressures.

Anything you guys might have, or can dig up for me would be immensely appreciated......and won't be forgotten....

Thanks gang...

Bob