On 26 OCT I ran a test of Mikey's load, but am just now getting around to posting results. (Sorry, was too busy playing with other guns & loads!) I used a 200g Mt. Baldy LSWC-K from Mt. Baldy, over 3.8g Win231, with standard small pistol primer. NOTE: these are seated deep. . .crimped over front shoulder, as they don't fit reliably in .38SPL chambers if crimped at crimp groove. BE ADVISED: this will increase pressure by an unknown amount.
Colt Detective Spl. (2" bbl): 761 fps average vel. (approx. 8' from muzzle). Hi vel 785, low 744, SD of 12.72. Muzzle energy 257 fpe.
Cimarron Lightning (3.5" bbl.): 816 fps average vel., Hi = 839, Low = 785, SD of 17.52. Muzzle energy 296 fpe.
Temp was about 65 degrees, elevation perhaps 100' (hey, it's south Louisiana, we call that hilly!) Sun was low--late afternoon.
A side note: although I was finishing off a few rounds of .45LC and didn't have enough for a full 10-round string, the four Winchester 225g STHPs I fired from a 4" S&W Mountain Gun ranged from 768 fps to 815 fps with a ME of 315 fpe. Although I don't rely heavily on muzzle energy figures personally, it's an interesting comparison to the Cimarron Lightning with Mikey's load. . . .