RE: Arrow weight vs Arrow speed
i'm shooting approximately 450 grains (weight includes vanes, nock, tipand shaft) at 270 f.p.s. which gives me the kinetic energry of around 75 and is considered enough to kill the largest game, i.e. cape buffalo. you can take someone shooting a lighter arrow at 300+ f.p.s. and they will not have the penetration i have with the heavier arrow.