speed does matter and it matter a whole lot. deer jumping the string, trajectory, energy are some of the reasons.
Speed can help on a longer shot, but isn't a cure-all. No bow--not even the fastest compound--is faster than a deer's reflexes.
[QUOTE] a certain amount of energy is required for proper penetration but that can be gotten from speed or mass,
try shooting a lead pipe in your bow, see where that gets ya.[/QUOTE]
Not exactly a fair comparison. The other end would be to try shooting a feather or ping-pong ball from your bow and see where that gets you.
I don't like super light or super heavy. It blows my mind to see points weighing 200+ grains. I think this came about when people were trying to get carbons that weren't offered in low enough spine to shoot from lighter recurves and longbows. Just a guess. Also makes me scratch my head when I see 65 grain broadheads. Mr. Bear didn't seem to have a problem killing stuff with 125 grain heads.
I personally don't use expandables, I don't recommend them, but there's been great improvements made on them over the years and some use them sucessfully. I just don't see any point in adding expense and moving parts when fixed heads have been proven to do the job just fine over the years.
Chad