I did recently read an old post by John Ross the author of "Unintended Consequences" about how back in 1972 he worked up a load for the .357 Auto Mag that had a muzzle velocity of 2870 FPS with a 90gr bullet from an 8 1/2" barrel. That velocity would likely penetrate anything less than class IV soft body armor.
But how would you carry or conceal an auto mag with such a long barrel?
NRA Life Member - Orange Gunsite Member - NRA Certified Pistol Instructor
"When plunder becomes a way of life for a group of men living together in society,
they create for themselves in the course of time a legal system that authorizes it and a moral code that justifies it." Frederic Bastiat