i wonder uncut shaft have more weight than cut the arrow ? well i was wonder if GT volecity shaft weight 246 gr in full shaft or at lenght ? i'm not sure, have you weight uncut shaft and cut shaft is any different weight ?
you should be able to find grains per inch (gpi) on all the manufacturer's websites for every shaft they make. then you multiply that times your arrow's length.
just take a look at gold tip yeah they weight in 29" lenght, GPI but i'm plan to get arrow scale and need to cut to 28 1/2" it would be few grain off from 29" ..