Just a endnote.

Never assume that different heads will weigh the same and fly the same just because each states that they are the same weight. It is not uncommon to find that the weight of broadheads to be less or more than what the manufacturer states.

Configuration (design) of heads comes into play. The physics of flight on a fieldpoint is not the same as it is on most broadheads, regardless both weigh the same. That is why I do not try to get fieldpoints and broadheads to fly and group the same.