Powder sensitivity to temperature

[Mesa]

Anybody know of websites with information on various powder brands/types sensitivity to temperature change?

I've been usunf 4064 for years now but somebody told me it was very temperature sensitive.

Mesa

 

[mete]

The british cordite was supposed to be more sensitive than most . I have some data for a30-06 load but the powder is not identified .The curves for velocity and pressure are not linear , the pressure rises more rapidly then velocity as the temperature increases. Proper reloading info should specify temperature which in a lab is usually 68 F. The data I have shows 42,630 psi at 68 F and rises to about 46,000 at 104 F. Try to develop loads under the temps you are going to shoot and keep ammo out of the sun.

 

[Grump]

According to Hodgdon's web site, 4064 is about halfway between Varget and WW748 for temperature sensitivity-velocity, in .308 using 168-gr HPBT match bullets.

That's close enough for me. If you have a good load, why switch? Is your shooting under circumstances where that's really a problem??

BTW, I've never had a problem with my developed-at-85°F loads in 748 spiking pressure when I fired them at 110°F.

 

[Mesa]

I think I'll just stick with the 4064 then. Thanks folks!

Mesa

 

[WESHOOT2]

TESTING

In handgun loads I've noticed certain traits of certain powders, but I've also learned what happens through MY gun may not necessarily happen through yours.

All very scientific; as always, testing required.

 

[Ivanimal]

This is precisely why I have switched to Hogdon extreme powders in all my hunting loads. I have seen a 2-3 inch difference in 100 yards going from the Sierras to Bakersfield.

Still a minute of deer but fox and squirrel have a good enough chance against me already.