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Only problem is that it's 50 bucks for a box of 50 and the ballistics of the 5.7 out of a pistol barrel are only about 1550 fps/216 fpe. The muzzle velocities that I quoted earlier of 2300 with a 32 grain bullet and 2100 with a 40 grain bullet were listed as pistol velocities but were in fact rifle velocities.Gold Dot in 5.7? Interesting.
The 22 TCM produces higher velocities out of a 5 inch barrel than does the 5.7 but the advantage to the 5.7 is that the smaller diameter of the 5.7 case allows for greater magazine capacity.
My opinion is that the 9mm is a better defensive round with 17+1 rounds of 124 grain HST's in a G17 or G45 and is easy to control and the guns themselves are simple to operate ande recoil is not an issue and the 9mm most likely has less muzzle blast.
But just for fun purposes, this new Ruger is a great gun at a much more affordable price than the FN Five-seveN and if it proves to be popular, ammo prices will come down as the ammo begins to be produced in greater volume.
Here's a good article comparing the 5.7 when fired out of a pistol to the 22 Rimfire magnum and the 9mm Luger. The only thing that invalidates the comparison between the 22 mag and the 5.7 is the barrel length of the test pistols with the 22 magnum having a longer 6.5 inch barrel.