Couple issues: Without a plastic shot wrap (when using with fiber wads) around steel shot it will score the heck out of a barrel. Without at least a plastic gas seal over the powder, pattern performance will suffer at distances beyond skeet range...assuming old style nitro card wads are used directly over the powder charge. I know...I started reloading shotshells before the advent of plastic one piece wads, plastic gas seals for over the powder, and shot wraps.