John - Forsyth spoke of 'point blank range' sighting being taken over the folded leaves - as in when stalking through tight jungle. The sights would be folded to prevent unjury to them, and only raised if there was time, the sighting being taken over the leaves, the actual elevation for a 5 to 25 yard shot being given by the elevation of the breech (diameter). This was normal for smaller bores, ie: 14 to 16.

This probably would not work well in your 10 bore ctg. gun, as the requisite amount of powder to give a long point blank range is more than will fit in the ctg.

However, it might still be good to fire a couple shots, sighting over the folded leaves, placing the entire bead and it's base on the level surface of the leaves and see where the ball lands at 10 yards or 20 yards. Might be interesting and it could be on the bead, which would be perfect.

This is the sighting for my single shot 14 bore rifle - all leaves folded, base level on the leaves - ball hits on the bead to 50yards. So- if there isn't time to raise the first leaf, accurate sighting can still be made - close in.