This time we have a showdown between Federal Hydrashok 135g 9mm, Winchester 115 gr. USA JHP, and just for fun, Federal Hydrashok 180g .40. Reviews first, then pics. All of the round pentrated 1.5-2.0" inches before expansion, and the wound tract was of surprisingly similar size and shape between all 3 rounds. The .40 wound channel was actually smaller than the Winchester 9mm. I unfortunatley had no means of accuratley measuring the channel because the gel kept tearing. Winchester Cheapo 9mm JHP: Largest wound channel of all of them. 12.5" of penetration, a little less than most consider "acceptable" for personal defense, retained full bullet mass, expanded as designed, the jacket did fold back around the the round more than I would like as it would seam easily seperated from the lead. The recovered bullet had expanded to very very close to the size of the .40 expanded... Over all, at 9.99/50, not a bad choice. Federal Hydrashock 9mm 135g: Smallest wound channel of them all, 14" of penetration, lost bullet mass and the jacket partially seperated. The expansion was not uniform and very sloppy. I have heard of problems with the 9mm hydrakshock breaking up, but wanted to confirm it for myself. Confirmed. I will be replacing this ammo with something else for carry, More tests to come on what the replacement will be and just for fun: Federal Hydrashock .40 180g: Wound channel size was right in the middle, 14.5" of penetration, retained full mass. Expanded very nicely, no jacket seperation, good performance overall. Ok and now for the pics: The winchester: The 9mm hydrashock: And a comparison of the 2 9mm rounds: and the .40 hydrashock DISCLAIMER: These tests are hardly scientific, but do reveal some interesting information. Draw your own conclusions.