>>93907.38/200, also called .380 Mk.II or .380 Mk.IIz, (depending on if the British felt like they were afraid of the Hague convention or not), is a somewhat peculiar load of .38 S&W, putting out a 200gr bullet at like ~630fps, so pretty heavy in relation to its velocity.
The oblong length and heavy weight vs. the low speed would actually make it tumble upon penetrating flesh, so it actually wasn't too bad for its modest joules, typically expending its energy on tumbling around in the wound, rarely ever overpenetrating.
Aside from the Enfield and Webley revolvers, Britain would also buy Smith & Wesson revolvers chambered in .38-200, shipped from overseas.
The semi-conical projectile shape of the .38-200 reminds me a lot of the typical bullet used in .455 Webley