FYI...if anyone is interested, I tested "large buckshot" type loads in my .62cal smoothbore flinter, using 80grns Goex FFg and Hornady .440's & .490's in paper shot cups.
Quanty four of the smaller .440's had such offset in their stagger stack that they opened up too fast, 15-18" patterns and the patterns were so erratic and unpredictable that I stopped the testing after a half dozen shots.
However, quantity three .490's were outstanding...they stacked a lot more vertically due to their larger diameter and gave very consistent 3-4
Quanty four of the smaller .440's had such offset in their stagger stack that they opened up too fast, 15-18" patterns and the patterns were so erratic and unpredictable that I stopped the testing after a half dozen shots.
However, quantity three .490's were outstanding...they stacked a lot more vertically due to their larger diameter and gave very consistent 3-4