silentassassin wrote:
All that being said you won't see more than 1-2 foot pounds of difference when going from say a 300 gr. arrow to a 500 grain arrow. Also, there is something called the law of deminishing returns. In other words a cam may more more efficient up to a certain weight and any extra arrow weight you add after that point will actually decrease efficiency.
A bow with 100 grains virtual mass throwing a 300 grain arrow 280 ft/sec WILL throw a 500 grain arrow at precisely 228.6 ft/sec. In terms of KE thats 52.2 ft/lbs vs. 58.0 ft/lbs respectively or a 5.8 ft/lb increase. In terms of efficiency the bow transfers 75.0% of its energy to the lighter arrow and 83.3% to the heavier. This is not opinion its is mathmatical certainty. You are simply incorrect when you say you won't see more than 1-2 ft pounds of difference. Also, with regard to a point of diminishing returns in efficiency, efficiency always increases with arrow mass at least over a practical range of arrow weights.
Although I disagree with your numbers I do agree with the point you are making. The difference between 50 ft/lbs and 60 ft/lbs is, as datamax said, how deep the arrow goes into the dirt after passing through the deer.