After talking to quite a few archers and archery shop employees, it seems like the majority of the compound shooters use arrows that weigh around 400 to 430 grains total weight - and most use 100 gr. heads. (Guess this would be a good poll question)

I'm wondering why more shooters don't use 125 gr. heads for hunting. An arrow that weighs 9.4 gpi with a 100 grain broadhead will have a total weight of about the same as an arrow that weighs 8.5 gpi with a 125 grain broadhead. If the arrow diameter is the same, the lighter arrow with the heavier head should have better broadhead flight and better penetration - based on FOC principles - right?

Only downside I could see to all this would be that the 125 grain point might require the next stiffer spine rating, and subsquently move you into an arrow shaft that is heavier and/or fatter. My 61 lb. bow, for instance,can use the3-39 series arrows with 100 grain points; but actually needs the 3-49's for 125 grain heads.

But otherwise, why don't more folks use 125 grain heads?