Compound bows how to tell how far?

A little knowledge goes a long way, science stuff aside most 40lb draw weight bows can toss an arrow 150yds or more. With the right bow, arrow and field point or broad head some draw weights down to 25lbs can accomplish that. What the difference is in the state regs from state to state is a lack of understanding of the mathematics in archery. Those that know the formulas know what gear they can use to comply with the law. Those that really want to take game and have quick clean kills don't go by the "minimums" but by what they know will do the job best. Nearly every states hunter education makes this point. Most hunters use bows in the 50lb -75lb + draw weight for great penetration in all game.