10mmShooter
06-05-2010, 10:48 PM
Observations after 3 hours at the range with my chronograph
I used LE Federal 180g Hydra-Shoks(P40HS1G) as my control round to check the chrono and my measuring methods. Through my Beta Master Chrony I showed 945.89 fps with an SD of 10.77 fps. I was very happy with this result as expected the premium factory round has a very low SD, and the 945 avg fps is close to the factory stated spec of 1000 fps. Test conditions were 85 degrees and 90% humidity which kills velocity.
Through out my 3 hours of testing 17 different loads in 3 calibers .38 spec, 10mm, 44 mag(all shot out of 8-3/8 686, 8-3/8 Anaconda and two 610's). I observed something unexpected, I load with a Dillon 650 and Redding Big Boss II and Redding 3BR powder measure combo. I would have expected my loads that I loaded with the single stage press should have a lower SD that the loads from my 650. It all comes down the Dillon power bar vs the Redding 3BR powder measure. I was loading Green Dot a flake powder in the Dillon and AA#5 in the 3BR. Obviously the AA #5 ball powder should meter better than the Green Dot flake you would think??.
My actual results for the 17 loads in 3 calibers showed an SD range of 9.61 fps to 18.5 fps , I was very pleased to have all my loads under 20 fps SD.
Anyone ever notice anything similiar?? The Dillon press continues to impress me.
I used LE Federal 180g Hydra-Shoks(P40HS1G) as my control round to check the chrono and my measuring methods. Through my Beta Master Chrony I showed 945.89 fps with an SD of 10.77 fps. I was very happy with this result as expected the premium factory round has a very low SD, and the 945 avg fps is close to the factory stated spec of 1000 fps. Test conditions were 85 degrees and 90% humidity which kills velocity.
Through out my 3 hours of testing 17 different loads in 3 calibers .38 spec, 10mm, 44 mag(all shot out of 8-3/8 686, 8-3/8 Anaconda and two 610's). I observed something unexpected, I load with a Dillon 650 and Redding Big Boss II and Redding 3BR powder measure combo. I would have expected my loads that I loaded with the single stage press should have a lower SD that the loads from my 650. It all comes down the Dillon power bar vs the Redding 3BR powder measure. I was loading Green Dot a flake powder in the Dillon and AA#5 in the 3BR. Obviously the AA #5 ball powder should meter better than the Green Dot flake you would think??.
My actual results for the 17 loads in 3 calibers showed an SD range of 9.61 fps to 18.5 fps , I was very pleased to have all my loads under 20 fps SD.
Anyone ever notice anything similiar?? The Dillon press continues to impress me.