Retumbo V Temperature

[wadcutter]

I have been playing with Retumbo powder (AR2225) in both a .338 Edge and a .375 Snipe Tac.
The results of my testing seem to lean towards some small amount of temperature sensitivity with this powder.
Can anyone state for sure just how temperature sensitive this powder is and give some sort of numbers on its effect in their rifles?
It would be a great help.
Thanks.

 

[kombayotch]

Re: Retumbo V Temperature

Bottom axis is degrees F.

 

[DBohn]

Re: Retumbo V Temperature

Retumbo and H1000 actually got slower with an increase in temperature!? Am I reading this right?

 

[kombayotch]

Re: Retumbo V Temperature

That's what happened during the test... been meaning to repeat it, but haven't had the time. Not a difficult test to run if you're so inclined...

 

[wadcutter]

Re: Retumbo V Temperature

Kombayotch,
That is outstanding info. Thanks for that.
I am also surprised that velocity decreased with a rise in temperature. I was looking for a similar magnitude but with an opposite effect.

 

[kombayotch]

Re: Retumbo V Temperature

You should test it. I find the negative temperature slop strange, but I've got that on more than one of the slow burning extreme powders.