I have 4 revolvers on hand that chamber the 38 S&W. 1) Iver Johnson "Owl Head" top-break, 3" barrel. For a mid-quality arm, it is quite well-made. I shoot docile .375" roundballs run through a .363" H&I die--seated with a small bit of case mouth ahead of the ball radius--roll crimped--then a drop of LLA squeezed into that little "ditch". 2) Colt Police Positive x 4" (1920)--a little jewel. #358477 @ .359", 3.0 grains of Unique imparts 700-725 FPS. 3) and 4)--Webley-Enfield WWII top-break and S&W M&P x 5"--both get NEI #169A (202 grain RN) atop 3.0 grains of Unique or 3.3 grains of Herco. The former load runs about 650-675 FPS in both guns, the latter Herco load gets 675-700 FPS. These 38/200 loads are on another level from what is seen in most 38 S&W shooting.