Seyfried's article is in the winter 2009 DGJ. A gunsmith friend worked up some loads for a 12 bore Cavenaugh oval bore double, I know he used a paradox bullet and Federal paper cases. he said everything he changed,(wads, powder, ...) showed on the target. In the end, it would shoot 2" groups at 100 yards. The happy owner shoots his deer with it every year.