OH, I am told the Hydro-Shock can plug when passing threw heavy clothes and not expand.

I've heard that too, but nobody has ever shown any evidence of it to me. It always sounded like a bunch of crap to me - a range rat's urban myth. Of course, I'm willing to be proved wrong.

The Hydra-shok bullet is skivved to aid expansion into a number of petals and any material getting in the hollowpoint is just going to force the petals outward more as it encounters further resistance. That's the whole idea behind a hollow point.

I am under the impression that the EFMJ was developed for politically correct agencies that prohibit hollow-point ammo. I've also heard on other forums that the EFMJ may have a failure to expand rate of about 20%.

I've heard that too, but nobody has ever shown any evidence of it to me. It always sounded like a bunch of crap to me - a range rat's urban myth. Of course, I'm willing to be proved wrong.

The Hydra-shok bullet is skivved to aid expansion into a number of petals and any material getting in the hollow point is just going to force the petals outward more as it encounters further resistance. That's the whole idea behind a hollow point.

I am under the impression that the EFMJ was developed for politically correct agencies that prohibit hollow-point ammo. I've also heard on other forums that the EFMJ may have a failure to expand rate of about 20%.

hydro means water or fluid, the round uses body fluids to cause the expansion, that why it won't expand when it is plugged.

IDPA_Shooter has a friend named Tony who works for MPLS PD, I am told that he has attended several autopsies in St. Paul where EFMJ was used and the expansion was very good. Although I have noticed that recently the law enforcement version of the round was dropped from 124g to 105g and the round was made a +P.

I personally use hydro-shock in the non-jacket months and EFMJ in the jacket months. I personally think ANY premium round will do a good job, I just like buying Minnesota products when I can.

Any of several small freshwater polyps of the genus Hydra and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles.

The Bo'o' Truth handled JHP here -> http://www.theboxotruth.com/docs/bot8.htm
They show an unexpanded jhp after passing through denim, water, and boards next to a Hydrashock that expanded perfectly. They didn't shoot it through the denim though...

a round of Power Ball, .38 Special +P 100 grain, advertised at 1400 fps. -> It penetrated 5 jugs and came apart. Four jugs is considered the optimum minimum penetration since it equals about 12 inches of BG penetration. This one did even better than that.

Then a round of Federal Premium .38 Special High Velocity 147 grain Hydra Shok JHP (P38HS2G). Penetrated 4 jugs and expanded as designed.

finally, the round that everyone in-the-know says is the best of the best for short barreled .38 Specials, the Speer Gold Dot, .38 SPL +P 135 gr. GDHP. Sure enough, it expanded as designed and penetrated 4 jugs.

I think if you contacted BOT and gave him the $ for the ammo he would do the tests for you.