At an auction I picked up a cartridge that was described as “22 NATO US Experimental, 7.62mm necked to .22” (actually, it was my first auction and the lots I wanted went too high, and I did not want to go home empty handed, so this one was within my budget).
The cartridge is headstamped WCC (at 12 o’clock) and 53 (at 6 o’clock). It has a brass primer that is ringed in. The case is brass, bottlenecked, rimless, and apart from the neck diameter and shoulder, is same as a 7.62x51 case. (I know a picture of it is great, but sorry but I have not worked out the photbucket image thing yet).
The bullet appears to be an GM FMJ and attracts a magnet. I suspect it has steel core rather than a steel jacket becasue the magnetic pull is almost non-existent at the tip of the bullet. The bullet has a knurled cannelure at the case mouth. Some of the dimensions of it I measured are:
Bullet Diam approx. 5.66mm/0.233".
Cartridge OAL approx. 67.11mm/2.64".
Case Length approx. 51.64mm/2.033".
Does this sound like a 22 NATO experimental? Could someone please tell me a little about these cartridges or direct me to a reference or two? I was reading on Tony Williams’ website an article about assault rifles and their ammunition. In the article he writes “American experiments were made in the late 1950s of smaller calibres, such as .22/30 NATO, the .25” Winchester (6.35x48), the .25/30 NATO (6.35x51) and the .27 NATO (6.85x51), but these led to nothing." Would the 22/30 NATO be referring to one of these 22 NATO Experimentals?
Thanks for any info.