[CrazyIvan]

Seems like kind of an exotic round for this kind of thing.

[Eric in the Ozarks]

It’s a rare round.

[RicocheT]

What agency has the .357 Sig round pistols? TSA? Most airports use local law enforcement for security and most cop shops use .40 cal. Do the feds just have another warehouse to fill with more ammo?

[ctdonath2]

It’s standard Air Marshal ammo. Moves fast, hits hard, shouldn’t need a followup, limited penetration. Costs a lot in both ammo and the barrels it tears up in practice. It’s what you buy when price is no object but performance & availability is.