my bow is about 6 years old, Browning Prism 80 (split limb/single cam) 31" arrows, about 67#, and 100 grain 3 blade muzzys. i went by the chart at the shop, and when i figured it out, the arrow weight was fine for the draw weight etc., and the 100 grain muzzys have it balanced really well. they shoot very closely from field pts, to muzzy practice blades, to broadheads. and i've never had an arrow split or shatter except from the robin hood shots.
the newer cams and bow designs would be a very good reason for the change, that's a very good point. it's been a long time, but i'm thinking i was shooting about 240-250 ft/sec, but i could be wrong. i know it wasn't near the 300 ft mark.
maybe i'll try them out during the season break before rifle season and see what happens. i don't want to try to change things up right now if all is well.
thanks for the replies.