What should be the minimum overall weight of an arrow for an Alaskan moose?
You should try for a minimum arrow weight of roughly seven grains per pound of maximum draw weight for moose. That would put you at about 500 grains or more with your 70-pound draw weight bow. If you want to shoot aluminum I’d recommend 2315s, and if you want to shoot carbon go with either Easton’s Kinetic II or Beman’s Carbonmetal Matrix shafts in their stiffest sizes. (If you shoot with your fingers you won’t be able to use the stiffest size because it won’t tune properly. The stiff size should be fine if you use a release aid.) Good luck. Sounds like a fun trip.