I am trying to find a load my new Storm likes . I loaded 10 rounds 75 gr hornady vmax over 44.5 gr win 760 and 10 rounds of 75 gr sierra hp over same powder charge . At 100 yds the hornady were 3” high and sierra were dead on . At 500 yds the sierra were 15” lower than the hornady . How could 2 bullets of the same weight and with same charge be sofar apart . Looks like the hornady fly a lot flatter . I don’t have a cronagraph.