I had an older bow that I hunted with for 23 years and used aluminum arrows and 3 blade wasp fixed broadheads. They hit where I aimed and I never had any problems and lost count of the deer I killed with them. I had it set at 50 lbs draw weight and it only 40 or 50% let off and most shots were pass throughs. I can only remember 2 or 3 that dropped within 40 or 50 yards with one going only 15 yards. 5 years ago I switched to a newer, faster bow, turned the weight up to 65lbs and started using carbon arrows and mechanical broadheads. Out of the 14 deer I've killed with it, I've literally watched 10 or 11 of them drop within 40 yards and only had a couple to go more than 100 yards. All were pass throughs and left very easy to follow bloodtrails. It would be hard for me to switch back to fixed broadheads at this point. I would never even consider using a mechanical out of the old bow because I just don't think it would have enough energy to give me a pass through. Who knows, as I get older and have to lower my poundage on the newer bow, I may go back to fixed blades.