Today I took several .38 handloads up to the range, along with my Ruger 50th Anniversary Blackhawk chambered for .357 Magnum, and my S&W Model 15-3 Combat Masterpiece, chambered for .38 Special. Here are the results:
All strings below are 10 shots.
From a Ruger 50th Anniversary Blackhawk .357 with 4-5/8" barrel:
.38 Special
21 grains Swiss 3Fg black powder
Missouri Bullet Company 158 grain LRNFP with BP lube
Mixed brass
Servicios Aventuras primers
MV 845.5 FPS
250.9 Ft-lbs.
ES 61
Max 881 FPS
Min 820 FPS
SD 16.7
.38 Special
21 grains Schuetzen 3Fg black powder
Missouri Bullet Company 158 grain LRNFP with BP lube
Mixed brass
Servicios Aventuras primers
MV 655.9 FPS (Weak sauce)
151.2 Ft-lbs.
ES 94.7
Max 712.9 FPS
Min 618.2 FPS
SD 27.8
From a Smith & Wesson Model 15-3 Combat Masterpiece with a 4" barrel:
.38 Special
Lee TL158-SWC, 158 grains
4.7 grains of Unique
Mixed brass
Servicios Aventuras primers
MV 842.5 FPS
249.8 Ft-lbs.
ES 162
Max 906.1 FPS
Min 744.1 (WTF?)
SD 47.8
.38 Special
Lee TL158-SWC, 158 grains
4.4 grains BE-86
Mixed brass
Servicios Aventuras primers
821.1 FPS
236.6 Ft.-lbs.
ES 42.8
Max 842.8
Min 800
SD 14
The BP load with Swiss would be decent for defense. This is probably comparable to the original black powder .38 Special round in muzzle velocity, with the same weight bullte. In contrast the Schuetzen load is so slow it performs closer to the weaker .38 Smith & Wesson round.
I crunched the numbers on the Unique load after dropping the low shot. It gave an average muzzle velocity of 853.5 FPS for 256 Ft.-lbs. of energy. Bumped up to 5.0 grains it averages 925.4 FPS and 301.2 Ft.lbs. of energy. That's a very solid woods or defense load.
The load with BE-86 exceeds most standard pressure 158 grain .38 Special loads in performance. Not bad at all. With a couple extra tenths of a grain it could probably exceed 900 FPS and give .38 +P levels of performance.