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Well, based on Marshall Stanton's suggestion, I have now tested some loads using No. 9 in 45 Colt. My loads consisted of a 265 gr. SWC GC in Starline brass w/ WLP primers (std and mag). I began with a start charge of 18.5 grains of No. 9 and worked up to 20.5 grains in 1/2 grain increments. The loads burned very cleanly w/ just a little unburned powder left in the barrel after each string.
I fired these in 10 shot strings over my chrono on Saturday with the temp around 70 F. My 5.5" Bisley-Vaquero was used for all testing. My results are as follows:
Charge Avg FPS E. Spread Std. Dev.
--------- ---------- ------------ ------------
18.5 1084 80.19 21.70
19.0 1078 ? 112.10 39.37
19.5 1124 131.10 44.28
20.0 1130 151.90 47.06
20.5 1131 101.40 27.80
All cases extracted easily and showed no obvious signs of excess pressure. However, the velocities I got are much lower than I expected and as you can see there was very little change in velocity for each 1/2 powder increase. Also, the extreme spread numbers are a lot higher than I am used to getting from the faster burning powders I use. I also rans a test using the same components listed above except w/ 2400. The same 18.5 to 20.5 grain range of powder was tested and yielded similiar results, except slightly lower velocities were reached.
What could my problem be? Could the B/C gap on my Ruger be too large and is allowing too much gas to leak out? My Ruger doesn't seem to exhibit this same "shooting slow" characteristic with faster powders like Titegroup and Universal Clays, so I don't know what is going on.
Any ideas guys?
I fired these in 10 shot strings over my chrono on Saturday with the temp around 70 F. My 5.5" Bisley-Vaquero was used for all testing. My results are as follows:
Charge Avg FPS E. Spread Std. Dev.
--------- ---------- ------------ ------------
18.5 1084 80.19 21.70
19.0 1078 ? 112.10 39.37
19.5 1124 131.10 44.28
20.0 1130 151.90 47.06
20.5 1131 101.40 27.80
All cases extracted easily and showed no obvious signs of excess pressure. However, the velocities I got are much lower than I expected and as you can see there was very little change in velocity for each 1/2 powder increase. Also, the extreme spread numbers are a lot higher than I am used to getting from the faster burning powders I use. I also rans a test using the same components listed above except w/ 2400. The same 18.5 to 20.5 grain range of powder was tested and yielded similiar results, except slightly lower velocities were reached.
What could my problem be? Could the B/C gap on my Ruger be too large and is allowing too much gas to leak out? My Ruger doesn't seem to exhibit this same "shooting slow" characteristic with faster powders like Titegroup and Universal Clays, so I don't know what is going on.
Any ideas guys?