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I will tell you this though, and it actaully agrees with your above statement. My bow likes a heavier arrow as far as the amount of energy it will devolop. I went to a shop and chronoed some different arrows at different draw weights and then came home and entered the data into the Archer Program. What I found is my Perfomance factor goes up with the heavier arrow. I only got 183 fps out of a 456 grn arrow at 42 lbs. But when I compared it to a 312 grn arrow moving at 214 fps the performance factor was way higher. Like 1.4 for the heavier arrow, vrs 1.2 something for the lighter arrow.
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Paul
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Well said, and I'd be willing to hunt with you anytime!

The 456 grain arrow drops about 5 inches between 20 and 25 yards, the 312 grain arrow drops about 4 inches between 20 and 25 yards.

IMHO, you might want to think about switching to the 456 (or sticking to it, I can't tell which arrow it is that you normally shoot).