wont disagree with that Lamb..but as to the 140grain heads or heavier...most of the time, unless your foc is really whacked, there is no need unless there is a broadhead you really like that only comes in...say 160 grain like the hill heads, there are others very similar that can come in lighter weights but the last I saw, the true hill points are still the ole 160 grains they have been since I started! I have a few buddies up here that persist on getting those heavy weights and its humorous to see there arrow flight....partially I think it has to do with there heads and not knowing how to match there set ups to them (increasing enuf in spine to make up for the heads)...when they do, they dont have a bow that is capable of getting those arrows off the shelf let alone through a moose...your right, speed isnt everything! But I do think there is a limit as to how heavy an arrow you have, will actually benefit the penetration you get before you start not only loosing momentum and ke but also your trajectory is really gonna suck LOL! Thats my only challenge...I am actually just under 11 grains per pound of draw shooting 60lbs pulling off speeds of 175-180fps with my longbow (last I checked it was mid to high 40's for ke)....more then adequate for a moose! Most of the whitetail folks though dont need this kind of weight but that we need to be heavy is so ingrained into stickbow folks its crazy...these same folks take 45 and 50lb bows and try and handle my 725gr ash arrows!!! Sure they are gonna penetrate a whitetail, but heck, is your setup really that efficient with that heavy of an arrow with such a light bow...imo I dont think so. Its kinda of a drastic difference but from what I have seen folks are doing just that across the country! I havent ran numbers to prove it, I do however have a buddy who knows this stuff much better then I....I'll pass this on to him and see what he has to say.