are you going for FAC or sub 12? i think sub 12 are all in the same bowl, on the other hand if you are going FAC get something that can consistantly give you around 40-45ft/lbs for the amount of shots you want to take from one fill.
if you want to go past 100yards, i suggest you get something like vermin hunter had setup around 50ft/lbs. im running mine at 57ft/lbs and will touch anything upto 150meters reliably... was filming some videos lately to putup over here.