interesting post, one or two points i`d like to make firstly .410 has one of the highest chamber pressures like for like of any bore hense it tends to fly a bit quicker so knock down is good, but there is less lead than larger bores so use smaller shot i typicely use 7.5 for pigeon full choke fibre wad great pattern at 35yds, if you do your bit they will come down one last thing if using magnum carts the shot string is very long which means you have to be accurate with lineup but lead is not quite so important, but a really good calibre great when you get the eye in .
engineer