I pretty much do what the OP does. However I do a confirmation run when I've found a potential good load.
I take 10 pieces of brass that I have set aside; they're the worst ones I can find in the batch I use. Half of them are badly underweight and the other half are badly overweight. I then load them, but weigh the charges 0.3grs light in the light cases and 0.3grs heavy in the heavy cases. I shoot all ten into one target at 200yds. If it all falls apart and won't hold about a minute of angle, I move on and find another load.
I don't like weighing charges and fussing about brass; this technique lets me know the absolute worst performance I can expect out of a load. After that I know I can just pull the crank. I shoot them in Highpower competition.