I find that statement to be 100% incorrect. As far as my testing goes, it's by far the most consistent BP sub on the market today. As long as you are using the proper equipment (primers and correct breech plug) for it. Seating pressure is about the only thing it's really picky at all about and to be honest, you should have proper seating pressure with ANY black powder or sub. His inconsistency had absolutely nothing to do with BH. Some sabot/bullet combos just don't work out of some rifles. Plain and simple.