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P90 ballistics are 31grn@2329 (9.5" barrel) for 370 ft/lbs. .22 Mag: 40grn@2020 (18" barrel) for 360 ft/lbs.
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But its not fair to compare it to .22 Magnum fired out of a barrel of twice the length. Given a long enough barrel, 22 Mag could be made ballistically equal to almost any pistol caliber.
A fair comparison is the two rounds fired out of equal (or nearly equal) barrel lengths. When this is done (as posted earlier), the .22 Magnum isn't even close to the 5.7mm.
Regarding the new 40 gr. civilian round, it isn't known yet what the velocity will be. There have been figures of 1300 fps, 1650 fps, and 2000 fps. FN doesn't even know what it will be. The round will be arriving soon in the US and FN expect it to be just under 2000 fps. Regardless of whether the new round is 2000 fps or 1300 fps, there are plans by at least one major reloading company to produce a 30-grain round that will be similar ballistically to the old SS192.
But in spite of all this, I wasn't talking about the new V-max SS-196 round, or the old SS-192 JHP, or even the LE/Military FMJ SS-190. This topic pertains to the 5.7mm SS-190 round's performance in shootings.
-DmL