[The Drew]

here is speer comparison

23918 357 SIG 125 GDHP Muzzle vel 1375fps PF 171.875
23920 357 Magnum 125 GDHP Muzzle vel 1450fps PF 181.25

23960 357 Magnum 158 GDHP Muzzle vel 1235fps PF 195.13
23961 40 S&W 155 GDHP Muzzle vel 1200fps PF 186

23969 45 Auto +P 200 GDHP Muzzle Vel 1080fps PF 216

23617 9mm Luger +P 124 GDHP 20 Muzzle vel 1220 PF 151.28


There it is, make of it what you will, but the .45acp +P load has the highest power factor of all of them. Does this make it the better manstopper, not necessarily, but it does have more "power".

Also you can see that the lighter 155gr .40 load compares well to the 158gr .357mag, and that the 125 sig load is trailing by the same margin to the 125gr magnum as well.

So the bottom line is that neither the SIG round or the S&W round actually duplicate the magnum's ballistics. They come close. And the .45 still has the ability to throw a large pill at a fairly high speed in +p trim.