The PSE Black Mamba shafts are the best I have seen for a "Tunable" extreme heavy arrow. They come with a fuzzy weight tube and a steel footing piece. The 3 one shot kills on Asian buff and the fact that all 3 could be reused are a testament to their toughness.

110# BW. i can barly lift that much, but how you guy make heavy arrows is very instering.  Doug77

Either cedar or hardwood.Usually about 780 grains with broadhead.I don't shoot over 80 any more though,I am down to 70# @28".

i shoot a 90# @31 silvertip. gold tip big game steel adaptor brass insert and fishtank tubing
and you can get your arrows petty hevy.the  tubing i get from home depot and at 30" its about 300 grains