i cant speak to performance because i havent actually shot a deer with mine yet, but i really cant imagine an extra 30 or 50 grains making that much difference (most of the special crossbow heads i see are heavier). Now i have heard on some of the mechanical heads for crossbows they design them different to stay closed and not open in flight, but i cant say if its true. I like fixed heads in my excalibur, the muzzy and the cabela copperhead both fly just like a fieldpoint for me.