SBS470,
try the site below, it may help?
http://www.hodgdonreloading.com/data/shotgun

H110 is the same as AR2205 if my memory serves me correctly?
This site has only 2 1/2" shells so the smaller 2" ones would most probably work at a lower pressure & lighter payload.
I didn't know you could get reloading gear for the old 410's!
Great pigeon gun & the best to start youngsters off with.
Seen one of these an old H&R Model 1900 bowl wallabies over at short range with no problem at all!
Will continue to look & if I find something more I'll post
best of luck mate
93x64mm