Re: my new .260AI custom
Rl22 does vary GREATLY from lot to lot but is still one of my most favorite powders. Just buy a 5lb jug and live happily ever after. H4831sc would also be something to look at.
Temp sensitivity is a concern if you vary the temp by 40 degrees or less. You will have to have a summer load and a winter load but that goes for <font color="red"> ANY </font> powder. I don't care about marketing, all I care about is what the facts are. The fact is that "extreme" powders can have all the deterrent coatings they want on paper, but paper and reality are two different things. I use the so called "extreme" powders, ball powders, single and double and even triple based powders, and I will argue with anyone that they are <font color="red"> ALL </font> affected by a ambient air temps to some degree.
Bottom line, keep track of weather during chrono sessions and stay on top of your load by frequent chronographing throughout the year. That is the only way to truly know what is going on. Marketing will get you so far, hands on testing will get you farther.
In any case, I have no doubt that you will find another suitable combo of powder and weight.
If it's not far, it's boring.