I've made no secret of the fact that I worked at Remington for two years developing ammunition. Pressure and velocity testing was performed at -20°F, ambient (about 70°F) and +150°F for all ammunition and one "blip" at hot or cold during a DV test (design validation test) out of thousands of rounds shot would send us back to the drawing board. All powders are temperature sensitive to some degree or another, and as you can imagine, we were always looking for powders that didn't show pressure spikes hot and cold. We tested many, many powders across numerous cartridges, calibers and bullet weights but that data is proprietary and can't be shown here. In addition, we had state of the art equipment that gave us a high confidence in the data and worked closely with chemists from companies such as St. Marks to tweak certain recipes.
Some people like to regurgitate what they've read on other forums and pass it off as their own knowledge or data. What I'm hoping is that some members here have actually done their own testing and would be willing to share the results. I will admit that all of my testing was carried out while I was getting paid by Remington. I live in a state where temperatures can vary from -40°F to +100°F and shoot all year round. In terms of accuracy I've not noticed a temperature issue shooting 6.5 Creedmoor, .308 Win, .300 Win Mag or .338 Lapua Mag out to 1,050 yards but that may be unique to how and where I shoot, the powders/primers I use, the load density etc.
If you're willing to provide data, I would ask that you show as much as possible to provide a complete picture of the test method, load data, rifle, weather, shooting position, brand of chronograph, calibration etc.
Thanks for your consideration.
Some people like to regurgitate what they've read on other forums and pass it off as their own knowledge or data. What I'm hoping is that some members here have actually done their own testing and would be willing to share the results. I will admit that all of my testing was carried out while I was getting paid by Remington. I live in a state where temperatures can vary from -40°F to +100°F and shoot all year round. In terms of accuracy I've not noticed a temperature issue shooting 6.5 Creedmoor, .308 Win, .300 Win Mag or .338 Lapua Mag out to 1,050 yards but that may be unique to how and where I shoot, the powders/primers I use, the load density etc.
If you're willing to provide data, I would ask that you show as much as possible to provide a complete picture of the test method, load data, rifle, weather, shooting position, brand of chronograph, calibration etc.
Thanks for your consideration.