My feeling is that you will get a slower heavier quieter arrow that has better penetration. It will hit a deer harder and break a rib easier when going through. On the bad side, you may have to adjust your aiming because it will drop faster due to more weight. ie you can now only aim with your pin out to 25 yards instead of 30, etc.

Put some 125gr field tips on and experiment from 5 yds out to whatever. If you are shooting 70lbs!, it may not be that different.