Dave - The 50/70 would have had the same power as your 20 bore paradox if it was shooting a .63 calibre bullet at the same speed. Size does matter when it comes to bullets and game. There is a bit difference in tissue displacement between the 32 bore and a 19 bore, between a pointed bullet and one possessing a hemispherical nose. No comparrison, even if they were the same calibre - the hemispherical shape ball wins out. The only one possibly better, would be a full groove diameter flat nose, but they usualy don't carry well.