Does anyone know the formula for Easton's minimum shaft weight? I know it's so many grains per inch, but I don't know the exact #s. Also, does this include broadhead weight, insert weight, etc. or is this simply the shaft weight only? Any help would be appreciated.

I'm not sure I understand what you're asking. Do you mean how to determine how many grains of arrow weight you're shooting per pound of draw weight? And what the recommended minimum is?

Well, you take your total arrow weight (broadheads, fletches, nocks, inserts, the whole shmeer) and divide that by your bow's draw weight. For example: a 420 grain arrow from a 60 pound bow is 7 grains of arrow weight per pound of draw weight.

A lot of people will tell you that bows are supposed to be shot at 5 grains per pound because that's what the bows are warranted at. That is totally WRONG. A warranty is not the same as a recommendation. AMO has a minimum recommended arrow weight chart. Jackson has it on his website. You will find it in the arrow shaft chart menu.

www.bowjackson.com