Always keep your load density above 50% that way if you do happen to double charge a round the case will over flow.
I use an RCBS Comp powder measure to throw all on the block @.3gn under grab one from the block then trickle up, drop weighted powder in, tilt the case & look in checking the level even though I have just dropped it in there, then seat that cases projie putting that finished round in another block in case I decide to do a run out check or meplat them all.