I shoot arrows from 709-715 grs out of bows 50-55#.I initially worked up the first bunch for a moose hunt and found that whatever trajectory difference there was,was negligible out to 25 yds..Maybe the mind just calculates it but I liked them so well I worked up similar weights for my favorite hunting bows.I don't like the idea of switching back and forth and having different setups for elk etc vs deer and antelope.That is where my mind doesn't work well.So I use the heavy arrows and all the bows have the same trajectory,I'm used to it and I don't have to switch bows and arrows if I go after bigger game.