RE: 60# versus 70#...No difference in power? Maybe
I think the whole point of this thread was that in some places you have a minimum draw weight requirement to hunt. This is not as relevant as it might have been years ago. Many bows now have so much more kinetic energy at lower than the minimum legal hunting draw weight would have had at the time the laws were enacted.
In most places in Africa the minimum draw weight for hunting dangerous game is 80lb and has been for a long time. This 80lb draw weight covers both compound and traditional archery equipment. The difference in speed and kinetic energy is huge!