Is H1000 temp sensitive?

Every powder is temp sensitive. The extremes are less sensitive, but not by much. Some powders are very temp sensitive.

In an 300RUM I saw about 50-60fps change from 10F to 80F with 95gr of H1000.

Probably less then Re-22 then? Just wondering because I heard people are using it in .243 AI's and its suppose to be a cooler burning powder to try and save the barrel a little bit...

No doubt. I seem to always come back to it.

But I am really starting to love RL22. Just seems to love to be ran hot.

I thought this was just me. I had the same thing with RL25.

My load of 22 shoots great, but out here during deer season it could be 90+ degrees one week and the next it could be snowing...

The 22 seems to be pretty cool, I can shoot 3 shots pretty quick then touch the barrel and it will be barely even warm...

I was reading about that 6CM (.243 with a slight shoulder increase) and they are getting 3000+ rounds out of it with H1000...

I think I'll try some H1000 for the heck of it...might even buy some of this to try out, http://www.imrpowder.com/8208xbr.html