Has anyone chrono'd British WWII (or post war) .380MKIIz? The FN .380 MKIIz (174gr FMJ) I measured (1970's production IIRC) was very slow, with the highest average MV of 589fps out of a 4" Colt, and even slower velocities out of Smith's and Webley's.
As already stated in the above posts the .38 S&W/.380 MKII seems woefully under powered for a service cartridge, what amazes me is that it was so popular, or at least well used, for so long. The government of India, as late as the 1980's, was purchasing Ruger Service Six revovlers chambered for this round. Some measured velocities for the .38S&W/.380 Revolver from an earlier post:
.38 S&W measured velocities, vintage and current