ORIGINAL: y2khog
Most bows require a minimum of 5gr/lb for warranty coverage. According to my math 74# @ 5.5gr/lb = 407grs total arrow weight. Subtract broadhead 125gr, insert 12gr, blazers 18gr, nock 12gr gives you a shaft weight of 240grs at 30". Or 8grs/inch. Sound about right guys?
Where id you get the 5.5 gr/lb? It's not critical, but it does change the math just a touch.
And fellow, my figures are based on manufacturers weights with a 29" shaft.