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FN Five Seven
I'm actually looking at one of these too.
The 5.7x28mm cartridge is a small caliber, high velocity cartridge created by FN Herstal in Belgium in conjunction with the FN P90 personal defense weapon (PDW) and FN Five-seven pistol.[8] Developed in response to NATO requests for a replacement for 9x19mm Parabellum, the 5.7x28mm is a bottlenecked centerfire cartridge that is somewhat similar to the .22 Hornet or .22 K-Hornet.[6][9]
if you shoot a five seven, you will want one.
While I think the 17HMR is a great rifle round, I think the .22 magnum would be better out of a handgun such as the new PMR-30.Unfortunately, the handgun is butt-ugly IMHO. How about a pistol chambered for .17 HMR instead?
I know a few people that have 5.7 pistols - they bought them hoping that the hot AP ammo would be available at some point. Last I heard they are restricting the good stuff for LEO / military use only. I know someone was talking about making sabots so you could load .223 AP instead. The hot AP ammo is a little terminator that would punch level 4 vests but the civilian version of the round supposedly won't.
The SS190 version of the 5.7mm cartridge uses a 31-grain, steel jacketed, steel tipped, aluminum core bullet. It is capable of 2350fps and it can defeat level IIIA body armor at 200 meters. The bullet contains no lead for environments that prohibit toxins.
The round is not cheap but as the weapon becomes more popular here in the United States, the cost should come down. Winchester will soon assemble the 5.7mm round from imported FN components and also plans to make a hollowpoint round.
The 5.7mm round has 379 ft-lbs of energy, compared to 1300 ft-lbs for the 5.56mm NATO. The recoil from the 5.7mm round is much less than even the 9mm.
The SS190 ball is not only flat shooting, but also capable of penetrating car doors and auto-glass with minimum ricochet potential. In contrast, the bullet is designed to stay intact and start a controlled tumble once it penetrates a soft medium, thus reducing any over-penetration worries. The SS190 ball penetrates between 11 and 13.5 inches of gelatin, compared to between 17 and 22 inches of penetration for the M855 dual-core 5.56mm NATO round.
Upon impact with soft targets, the 5.7mm ball tumbles one time, base over point. This transfers energy and limits over-penetration. The 5.7mm ball produces a wound cavity about the size and shape of the best 9mm 115 grain JHP +P+, except the peak occurs at a deeper penetration.
In the one shooting we had with the P90, the bullet performed well. In fact, the bullet performed exactly as it was designed. The autopsy provided detailed information about the wound cavity and travel of the bullets. None of the 5.7mm rounds fragmented and as far as we can tell, none exited either. The shooting itself was a violent confrontation with many rounds exchanged between the suspect and the react team. The suspect was hit multiple times with both 5.56mm and 5.7mm rounds.