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Joined: November 19 2017
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Posted: January 13 2018 at 2:27pm | IP Logged Quote hdwhit

First of all, so everyone can get it out of their system, I am not talking about a very tiny part of the male anatomy.

What I am talking about is a wildcat cartridge (yes, there are sporadic factory loadings) based on the 30 M1 Carbine brass necked down to 224 (or sometimes 223).

Col. Melvin Johnson (of Johnson Machinegun fame) came up with the idea of re-barreling the M1 Carbine down to 22. He (and his son, who is still alive, and I have communicated with him) ran a company producing new and re-barreled rifles to fire this cartridge. Plainfield Machine and later Iver Johnson (no relation), amongst others also chambered commercial M1 Carbines in this caliber. Production records filed with the ATF suggest as many as 2,500 rifles may have been made.   

It was hampered by the fact factory ammunition was only irregularly available and depending on who built your rifle, the bore might be .2230, .2235 or 0.2240 and unless you had a gunsmith slug your chamber and leade, you had no idea what you were dealing with.

This has been a long introduction to what is really a short post. I got "infected" with the 5.7mm "bug" back in the 1980's. I am still trying to perfect a loading for the rifle. My rifle's bore is one of those that is bigger than 0.2230 but not quite 0.2240, and so is referred to as 0.2235 although that is not 100% accurate. So, if you know anyone that has one, I would be willing to share everything I know with them and would love to learn from anyone who knows about loading for the cartridge.

The promise of the round is truly seductive; it is the "holy grail"; a semi-automatic rifle firing from a 30 round box magazine pumping out 40 grain bullets at 3,000+ fps with a flat trajectory to 300 yard and ZERO perceived recoil. Any constructive input would be welcome - along with referrals to friends that are familiar with this cartridge.

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Posted: January 14 2018 at 7:33am | IP Logged Quote RT58

I almost had my custom varmint rifle chambered for a .22/.30 Carbine round. I had read about them long ago and had looked for an Iver Johnson M1 chambered for the 5.7, which I never did find. P.O. Ackley had data for the .22 Carbine, which was made my a different inventor and also mentioned the 5.7 with a couple of loads for it. He also said data for the .22 K-Hornet could be used, but never having a rifle chambered in any version I can't verify that. After long deliberation on a number of possible chamberings I decided on the .221 Fireball and couldn't be happier. A good, M1 Carbine type semi-auto built around the Fireball would be a great rifle, in my opinion, for varmints and everyday use.

I ran across a forum not long ago dedicated to the 5.7 Johnson which I believe is attached to a site operated by Melvin Johnson's son, if you don't already know about it.
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Posted: January 15 2018 at 7:14am | IP Logged Quote Buffalogun

The cartridge goes by the name .22 Spitfire, also.


"Please Mr. Custer.......I don't want to go" Larry Verne
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