[MrPiper]

Which is fine if it's a 135gr bullet coming out of a .40S&W, not so effective as you define with a 180gr. Never understood why they made them in that weight.

that is the standard .40 round designed for penetration, good 180's will expand at close range. That is also what most factory .40 recoil springs are designed to use.

purpose of the .40 is less recoil than 10mm but more penetration than 9mm. This came about after the famous miami shoot out. (don't bring pistols to a rifle fight)

[Myrddin]

The Glock 23C with a Jarvis barrel (fully supported case head) is perfect when feeding 165 gr 40 S&W. The brass is reloadable too.

[03A3]

good 180's will expand at close range

Designs like Speer's SB stuff will, but there is no specification in the bid.