basically a .40 S&W cartridge necked down to 9mm...you can't to my knowledge make .357 Sig brass from .40 S&W brass because they both have the same overall case length...125 grain hollowpoints at 1425 feet per second in an effort to duplicate 4 inch barreled .357 Magnum ballistics in a flatter and faster reloading platform...I think I've talked myself into one..
"Then said he unto them, But now, he that hath a purse, let him take it, and likewise his scrip: and he that hath no sword, let him sell his garment, and buy one." Jesus, Luke 22:36
"I do not feel obliged to believe that the same God who has endowed us with sense, reason and intellect has intended us to forgo their use." Galileo
It's better to have it and not need it than to need it and not have it..