The ammo that made the 5.7's reputation are the 27 gr., non-expanding hollow points. They run about 2100 fps. out of a 5 inch gun. The 40 gr. Hornady V-Max stuff runs about 1740 fps. out of my gun.
All you need to do is shoot the 5 inch FN against a 5.5 inch Ruger in .22 Magnum Rimfire with 40 gr. ammo in each. The results are dramatic. Against a one gallon jug of water, the .22 rimfire mag. expands and penetrates, but does not swell the jug much. The 5.7 with the V-Max load blows the front half of the jug apart. The bullet fragments will be found at the back of the jug.
The 27 gr. loads are the kevlar penetrators. That bullet stays in one piece, but it tumbles after entering the jug. It also blows the front half of the jug apart. E
