True enough, bigbulls. I was operating on the assumption that the arrows were already determined to be equal in accuracy.

As to whether 40 grains would make a hill of beans difference on penetration... You don't know that any more than I know otherwise. On a standing, broadside shot where the deer lets you shoot him and doesn't move a muscle, yes you're probably right. On a shot where the deer decides to spin, duck and tear out, then who knows when even an extra half inch of penetration might make the difference between a short blood trail and a wounded/lost animal.

Too many people are rigging up their hunting gear purposely for ideal situations. Shooting the lightest arrows they can get away with is WAY up towards the top of the list on stuff that can work when everything goes right, but it's also way up the list of stuff that can turn on you and bite your buns when the least little thing goes wrong... You gotta consider that those ideal situations can turn into nightmares in a splintered instant.

You know, I quit watching bowhunting videos several years ago because I got absolutely sick of watching carbon arrows come to a screeching halt after about 6" of penetration in the rib cages of the deer they were shooting. The editors would always do a quick cut just after the impact and go to the hero shot, but playing the tapes in slo-mo would prove the arrows stopped dead. Back when everyone was shooting substantially heavier aluminum arrows on the videos, you rarely saw a shot that didn't whistle right thru.

I'm glad to see people starting to allow for a little margin of error in the stuff they take to the woods by choosing heavier arrows for hunting. I know they are doing so because several carbon arrow manufacturers are offering heavier arrows now. They wouldn't be doing that if the demand wasn't there.