I've always ran target loads that are well below maximum pressure. I have high confidence that the fixed volume of the bushings I use, don't drop dangerously high charges. I just can't see myself, checking every box, but no arguement if others do. If a weight seems off, the machine might have been jostled around different than the routine, but that powder drop is probably okay.
I'll weigh heavy loads one at a time, but I don't think I ever changed a bushing to hold the same weight powder drop, once a machine is set up. I pick up odds and ends from many vendors, but Lyman has been outstanding with customer service, from my experience. I had a different cheapie electronic import act up, all they asked for was some simple documentation, to get another one on its way to me. Even if it's not perfect, a scale in this application might be for screening and not precision.
