K80,

Yes its todays powders. Cordite was apparently very temperature sensative. Some of todays powders remain so too from what I've read, while some are very temperature insensative.

We get plenty of heat here in Md in the summer with plenty of 90*+ days and a few that go better than 100* too. I have noticed that some loads definitely kick more and are louder too. These are factory loads at that.

JPK