Was just messing arround today and put hose up the entire lenth of a 2315 arrow, took the weight up from 470grains to 1040grains!
Seems to shoot ok, was getting dark.
I did notice a huge increase in penetration, I shoot at a bag target and normally get them in arround 6-8 inches, the heavy arrow blows right through and through a 1.5 inch door with a field point.
Speed is slightly down but I'm only hitting 1-1.5 inch lower at 18yards, that is at 68# on my Border Black Douglas.
Had to tell I was so impressed