Several grains in difference doesn't mean a hill of beans, the best pro shooter in the world cannot shoot the difference in 5 grains. Think about what 5 grains does to speed, what 1-2 fps and our arrows don't travel a whole second so that's split into fractions of seconds at target distances....it's what, millimeters and again, the best pro in the world cannot hold that still... But yes, I weigh my arrows....