Sheeish

.40 S&W and .45 ACP are specific cartridges which have caliber as a characteristi.

for the O.P. the .40 S&W was designed for an overall cartridge length (O.A.L>) to fit the same length magazine well as pistols designed
originally for a 9mm LUger/9x19 cartridge.

Price - example Double Tap similar bullets
.45 ACP $38.95/50 rds
.40 S&W $35.95/50 Rds

1 small advantage of the .45 ACP is
shot shell ammo available for it. Anybody
know of a company making shot shells
for the .40 S&W?

Randall