I am sorry to be so long in response. Most of the CFE-223 that I had ordered was backordered for six weeks. It is also apparent that many replicate tests are needed before any conclusions are statistically relevant. I still have much testing to perform, but here are some general trends that seem to be significant. Much of this information we take as obvious, but I wanted to be thorough:
Ball Powders Tested: CFE-223, X-Terminator, H-335, BL-C(2), and TAC
NC/NG Stick Powders Tested: N-530, N-560, R-22
NC/DNT Stick Powders Tested: H-4831, Varget
Test conditions: Ambient 45-60 F, Freezer -31 F
General Observations:
1- Velocity changes disproportionately less than pressure as the temperature of the firearm and loaded cartridge change.
2- Temperature sensitivity in one cartridge does not translate to temperature sensitivity in another cartridge.
3- In this comparison, the larger cartridge was less temperature sensitive than the smaller. (a data set of only two)
4- Magnum primers do tend to mitigate temperature sensitivity in both cartridges tested.
5- The NC/DNT stick powders were the only statistically different powders in terms of pressure or velocity dependence on temperature (Varget in both cartridges and H-4831 in the Gibbs).
6- X-Terminator, and TAC will likely (after more replicates) show less sensitivity than CFE-223, H-335, and BL-C(2) at least in regards to velocity dependence on temperature in the 6x45.
7- In both cartridges; loads in the 62+ KPSI range (at ambient temperature) showed disproportionately less change (Pressure and Velocity) at the low temperature test.
Sorry I don’t have more at this time.
John
Ball Powders Tested: CFE-223, X-Terminator, H-335, BL-C(2), and TAC
NC/NG Stick Powders Tested: N-530, N-560, R-22
NC/DNT Stick Powders Tested: H-4831, Varget
Test conditions: Ambient 45-60 F, Freezer -31 F
General Observations:
1- Velocity changes disproportionately less than pressure as the temperature of the firearm and loaded cartridge change.
2- Temperature sensitivity in one cartridge does not translate to temperature sensitivity in another cartridge.
3- In this comparison, the larger cartridge was less temperature sensitive than the smaller. (a data set of only two)
4- Magnum primers do tend to mitigate temperature sensitivity in both cartridges tested.
5- The NC/DNT stick powders were the only statistically different powders in terms of pressure or velocity dependence on temperature (Varget in both cartridges and H-4831 in the Gibbs).
6- X-Terminator, and TAC will likely (after more replicates) show less sensitivity than CFE-223, H-335, and BL-C(2) at least in regards to velocity dependence on temperature in the 6x45.
7- In both cartridges; loads in the 62+ KPSI range (at ambient temperature) showed disproportionately less change (Pressure and Velocity) at the low temperature test.
Sorry I don’t have more at this time.
John