I have run two separate tests for the same load and achieved significantly different velocity readings. There are two differences between the two tests; the initial test used WSR primers and the temperature as 86 degrees, the second test used CCI std. small rifle primers and the temperature was 46 degrees.
Using W296 powder and 360gr. LBT with gc, the loads/velocities were:
23.5grs. = 1405fps and 1289fps
24.0grs. = 1425fps and 1317fps
24.5grs. = 1465fps and 1339fps
Considering primer and temp. were the only differences, my questions are "would the temp delta cause this significant a difference?" or "should I suspect the CCI std. primer contributed to the effect of the temp?".
I appreciate my best method would be to test with WSR primers at 46 degrees, but the good old Iowa weather isn't that cooperative. I use a Redding powder measure and Dillon digital scale, so feel confortable the powder measure is consistant. I use RCBS .454 dies (not 45L) and seat and crimp separately.
Appreciate any comments,
Respectfully,
Using W296 powder and 360gr. LBT with gc, the loads/velocities were:
23.5grs. = 1405fps and 1289fps
24.0grs. = 1425fps and 1317fps
24.5grs. = 1465fps and 1339fps
Considering primer and temp. were the only differences, my questions are "would the temp delta cause this significant a difference?" or "should I suspect the CCI std. primer contributed to the effect of the temp?".
I appreciate my best method would be to test with WSR primers at 46 degrees, but the good old Iowa weather isn't that cooperative. I use a Redding powder measure and Dillon digital scale, so feel confortable the powder measure is consistant. I use RCBS .454 dies (not 45L) and seat and crimp separately.
Appreciate any comments,
Respectfully,