Powder: Use powder that's most commonly available and can be used in multiple loads and Calibers. I use IMR 4895 for both 5.56mm (55grain) and 7.62mm (150 Grain) reloading.
What happens when SHTF in NBC catastrophy? What happens to Electrical power, internet grid in the event of EMD in "N" to our Electronics such as watches, computers, PDA, phones?
On the positive side, what has Mean time between failure of > 100+ years, doesn't need battery, always available when needed?
Agree with jstone, manuals have more than reloading data, some are better than others. After 15+ years of Reloading, I learned about causes of Slam Fires in Gas operating rifles (AKA: AR15, M4, M16) reloading from Sierra 5th Edition. When I pass away, next generation (or someone still alive) will have references.