I have always had them impact the same. I bareshaft first then switch to broadheads. I add weight to the arrow and keep a high foc until the bow shoots around 250 fps. That seems to be the magical number to get all heads to fly good. The difference betwen a 400 grain arrow flying at 280 fps and an arrow that is 505 grains flying at 250 fps is only 3/4's of an inch difference shooting a 30 yard target for 25 yards. If stand hunting orbear hunting over bait, I know the yardages. If I am setting up on a bull, I range the trees rocks etc, before I start my calling sequence. Watch out using mechanicals, some states it may not be legal. It may take a little work, but I beleive that all bows can obtain the same point of impact with broadheads and field points. I have taken more animals than I can count with the bow, and only one has been over 20 yards. For me I see no neeed for a bunch of speed. If you can see where I am going with this you will see that with speed comes a greater chance of planing, and tune and form becomes more critical. I know some of you can get a tune and shoot with good form and have no problem getting good flight with fixed heads and high speed. But over the grand scale, most archers would be better off shooting slower setups that are more forgiving instead of trying to be the guy who shoots lightning fast withpinpoint accuracy.Usually, from what I have seen in the average archer, with increase in speed, comes an increase of problems.