You don't need a heavy pull bow. A modern compound at 50#, or even 40#, will give you everything that a bow of 20 years ago at 60-70# gave you.
OH REALLY???? When did Newton's Third Law change?
Have there been improvements in limb materials and cam designs in the last 20 years? Certainly, but none that would come anywhere near making your statement accurate. Has there been changes in arrow components during that time? Yes. But the IBO formula of 30/70/350 has not changed and it doesn't matter if the arrow is aluminum or carbon, it still weighs the same 350 grains and the bow still has to move that much weight when drawn to 30 inches and set at 70 pounds pull.
Do we have drop away arrow rest now that help increase arrow speed? Yes we do. Do we have new limb and cam designs? Yes we do. But do those add up to allowing a 40 pound pull bow today equal a 70 pound bow 20 years ago?? No flipping way. Not even close.
And if you want to get all the speed that these new bows offer today, you are going to have to draw it back to 30 inches, shoot an IBO arrow weight, and set it at 70 pounds. You can't draw it to 28 inches, set it on 60 pounds and shoot an IBO arrow at anywhere near the top speeds and you sure as hell can't get anywhere near that set on 40 or 50 pounds.
