I also load everything one step at a time (when I reloaded last.)
Prime, put all cases primer up, check.
Put all cases primer down, put in powder. Any double or over charge shows up in pistol rifle is deeper so harder to see. I use powder that a double charge will overfill the case to make it evident.
Then add bullets. any not seated will also show up in a bullet block.
Weigh a good known loaded case. Then compare the rest to it.