Peter M. Eick
Member
I was out Chrono-ing again. 10 ft to chrono, 20 shots per string, 89f, 72% humidity, elevation of 79 ft.
The 357 Magnum used was a 1939 Registered Magnum. 6.5" barrel.
Starline brass, cci550 primer, 13.5x2400, 158 grn Lasercast. 1173 mean 34 sd
CBC brass, cci550 primer, 13.5x2400, 158 grn Lasercast. 1234 mean, 30 sd.
Remington brass, cci550 primer, 13.5x2400, 158 grn Lasercast 1217 mean, 36 sd.
Observation. Brass matters for velocity. Even though the range is not large (60 fps) there is a striking difference in over all speed even though the sd was not greatly different.
Starline brass, cci550 primer, 4.6 grns of Trailboss, 158 grn lasercast. 744 mean, 32 sd.
Starline brass, cci550 primer, 4.4 grns of Trailboss, 158 grn lasercast. 752 mean, 33 sd.
Starline brass, cci550 primer, 4.6 grns of Trailboss, 158 grn lasercast. 737 mean, 31 sd.
Observation, weird how more powder does not help in this case. Maybe within the tolerance of error, but need to run a larger ladder test.
The 38 special is a 1939 38/44 Outdoorsman, 6.5" barrel.
Starline brass, cci500 primer, 4.0 grns of Trailboss, 158 grn lasercast, 707 mean, 29 sd.
Starline brass, cci500 primer, 4.2 grns of Univ Clays, 158 grn lasercast, 843 mean, 54 sd.
Starline brass, cci500 primer, 3.7 grns of AA2, 158 grn lasercast, 813 mean, 21 sd.
Starline brass, cci500 primer, 3.5 grns of Titegroup, 158 grn lasercast, 849mean, 19 sd.
Starline brass, cci500 primer, 4.4 grns of Univ Clays, 158 grn lasercast, 902mean, 55 sd.
Starline brass, cci500 primer, 4.6 grns of Unique, 158 grn lasercast, 933 mean, 30 sd.
Observation. 4.0 grns is pretty mild with trailboss. I think I will work up to a bit more for a ladder test. Universal has a lot more sd then unique but both are worse then Titegroup. Trailboss, unique and AA2 were the most accurate. Its surprising what 2/10's of a grain of Universal will do to the velocities.
Now this same load 4.4 grns of Universal, starline brass, cci500 primer, 158 grn lasercast in both guns.
Registered 870 mean 23 sd.
Outdoorsman 887 mean 28 sd.
Observation is that they were a lot closer then I would have expected. I guess the difference between shoot a 38 in a 357 is not that much.
Last comment, a +P FBI 158 does 862 out of the outdoorsman and winchester 158 normal pressure does 742 out of the outdoorsman. Amazing how mild these are compared to standard book reloads.
Any additional observations?
The 357 Magnum used was a 1939 Registered Magnum. 6.5" barrel.
Starline brass, cci550 primer, 13.5x2400, 158 grn Lasercast. 1173 mean 34 sd
CBC brass, cci550 primer, 13.5x2400, 158 grn Lasercast. 1234 mean, 30 sd.
Remington brass, cci550 primer, 13.5x2400, 158 grn Lasercast 1217 mean, 36 sd.
Observation. Brass matters for velocity. Even though the range is not large (60 fps) there is a striking difference in over all speed even though the sd was not greatly different.
Starline brass, cci550 primer, 4.6 grns of Trailboss, 158 grn lasercast. 744 mean, 32 sd.
Starline brass, cci550 primer, 4.4 grns of Trailboss, 158 grn lasercast. 752 mean, 33 sd.
Starline brass, cci550 primer, 4.6 grns of Trailboss, 158 grn lasercast. 737 mean, 31 sd.
Observation, weird how more powder does not help in this case. Maybe within the tolerance of error, but need to run a larger ladder test.
The 38 special is a 1939 38/44 Outdoorsman, 6.5" barrel.
Starline brass, cci500 primer, 4.0 grns of Trailboss, 158 grn lasercast, 707 mean, 29 sd.
Starline brass, cci500 primer, 4.2 grns of Univ Clays, 158 grn lasercast, 843 mean, 54 sd.
Starline brass, cci500 primer, 3.7 grns of AA2, 158 grn lasercast, 813 mean, 21 sd.
Starline brass, cci500 primer, 3.5 grns of Titegroup, 158 grn lasercast, 849mean, 19 sd.
Starline brass, cci500 primer, 4.4 grns of Univ Clays, 158 grn lasercast, 902mean, 55 sd.
Starline brass, cci500 primer, 4.6 grns of Unique, 158 grn lasercast, 933 mean, 30 sd.
Observation. 4.0 grns is pretty mild with trailboss. I think I will work up to a bit more for a ladder test. Universal has a lot more sd then unique but both are worse then Titegroup. Trailboss, unique and AA2 were the most accurate. Its surprising what 2/10's of a grain of Universal will do to the velocities.
Now this same load 4.4 grns of Universal, starline brass, cci500 primer, 158 grn lasercast in both guns.
Registered 870 mean 23 sd.
Outdoorsman 887 mean 28 sd.
Observation is that they were a lot closer then I would have expected. I guess the difference between shoot a 38 in a 357 is not that much.
Last comment, a +P FBI 158 does 862 out of the outdoorsman and winchester 158 normal pressure does 742 out of the outdoorsman. Amazing how mild these are compared to standard book reloads.
Any additional observations?