need cartridge identification!???

[hillbill]

the other day a guy at work gave me a caseing he had picked up at the shooting range where the county police force does most of its shooting. i had never seen one like it, maybe yuall can help me id it. it is 22 cal, 1.130 in length, rimless with a case head dia of .305, the main body of the case looks strait walled with little or no taper and it is .315 dia, the shoulder is fairly short and sharp. it takes a small rifle primer. it has a military looking headstamp but the writeing is so small i cant read it and i dont have a good magnifying glass. does this sound familiar to anyone?? im really not up on all the last minute newfangled stuff and its definitely to modern looking to be very old. nobody around here that ive showed it to has seen anything like it before. its obviously some kind of varmint round unless it is for some kind of small assualt weapon although looks a little dinky to be used as a military type weapon.

[gwindrider1]

hillbill,  What I believe you have is the cartridge for the military's relatively new FN P90 weapon.  If you happen to be a sci-fi fan, watch Stargate SG1 on the TV and you will get a look at the weapon.

While the P90 is not available to civilians, I think that there is a firearm now that is.  These cases keep showing up on ranges, so there must be one out there.

I believe that this round was developed by necking down the 10mm Auto round to .22 or .23, not sure about the actual bullet diameter.  It is supposed to be a real screamer with velocity in the 2800-2900 fps range with a steel core penetrator projectile.

Wish I could tell you more, but maybe this info will put you on the right track. :-)

[Flash]

First of all, the 10mm round has a base diameter of .425 so it isn't a necked down 10mm. The closest thing that I can imagine, since it involves law enforcement is that someone has a converted M1 Carbine that was barreled in 22 as an experiment during WWII. The 30 Carbine case was necked down to accomodate a .224 bullet. If, that is the case I'm thinking of, the weapon is highly collectable and was most likely obtained by the local law enforcement via the Federal Government.

[jh45gun]

If you could post a couple of pics showing the headstamp and a side profile of the cartridge that may help some one here identify it. Jim

[New Hampshire]

Here is a link to the 5.7x28:
http://www.fnherstal.com/html/Index.htm
The FN Five Seven pistol is available to the public for sale:
http://www.fnherstal.com/html/Index.htm
Hope this answers your question.
Brian M.

[Racepres]

It does indeed sound like a 22-30 (m1 carbine) of some description, but I am not in a position to measure mine at this time.. Thare are quite a few different versions of this theme, mine is marked 22/30 Oresky, and it is real cool, as well as acurate but requires .223 bullets (could use .222's)  .. Marty
  P.S. reference the 22-30 MJM or the 5.7 Johnson for details in ctgs of the world..