Eddie makes a good point when he says leave nothing to chance.

Another important tid-bit is to check and double check every thing. I had an incident where the wife or one of the grandkids came in the room and distracted me. I double charged a rifle case. Fortunately, there was no way that amount of powder would have fit in a .308 case. Stay focused.

I won't tell you about the day I looked at the can of RL19 and grabbed the can of RL15.