I'm in the process of acquiring a Webley MKIV chambered for this round, and have some curiousity.
One of the truths about the .38 S&W cartridge - a bazillion different handguns have been chambered for it by a quarter-bazillion different manufacturers.
While the nominal bullet diameter for the round seems to be .361", many of the guns chambered for it were made after the introduction of the .357" diameter .38 Special, and some companies were making both concurrently. A good example is the Victory Model Smiths made for the Brits in WWII. S&W made K-frames in both chamberings during the war - I'm curious if they (and other manufacturers) actually bothered with different barrel tooling.
So, regardless of make, what's the bore/groove diameter of your .38 S&W's; what slugs are you shooting through them; and how happy is the gun about it?