What "Temperature Sensitivity Factor %" are you getting

[Doozy]

Hi all, brand new to the forum here.

I hate having to figure the temperature sensitivity factor because this means I have to shoot quite a bit of ammo at different times of the year. Because I'm getting a standard deviation of around 20 fps on these cartridges, I'm never going to be real confident that I got the right rating. Besides this, I know the outside temperature is not the temperature of the powder inside the cartridge (due to insulation and potentially direct sunlight).

So I wrote Igor Borisov since I was filling out the cartridge performance on my Stelok Pro app for my 300 PRC rifle shooting Hornady 212gr ELD-X (82166). I asked him if he could include a drop-down of known temperature ratings. I figured the rating would be the same for each type of powder and each specific manufacturer's secret-sauce powder for a specific cartridge. He responded and said that the database idea would be impossible because the same powder will show different temperature sensitivity in different calibers. (You learn something each day; that still doesn't negate the fact that he could list it for specific calibers, but whatever...)

I'm just wondering what % you are showing, because I'd like to know I'm even in the right ball park.

I was only able to record muzzle velocities for about 4 degree swing but I'm showing a temperature sensitivity factor of 0.3%-0.4%.

 

[Dthomas3523]

A freezer, cooler, and laser thermometer make getting temps much easier than waiting all year.

 

[Doozy]

@Dthomas3523 Brilliant!

 

[Steel head]

A freezer, cooler, and laser thermometer make getting temps much easier than waiting all year.