Which have you found to have good ES & SD ?
Ole mike,
The new Reloader 23 powder is supposedly designed specifically to produce good ES & SD numbers. I haven't tried it yet but the burn rate should be about right for the 280 AI pushing a 162 ☺ Alliants new Reloader 26 is designed specifically for velocity, not ES, SD so you might not see the best results If you decide to try it.
Trystan