Drew, I would ask the shooter if he ever checks the weight of the powder charge or does he just depend on the bushing chart. If he has not been checking weight of the thrown charge periodically you might have him run his reloader and collect a few samples. I know that I can influence the charge weight thrown on my reloaders by how I handle the equipment. I typically go down a bushing size to prevent heavier than desired charges on the single stage reloaders.