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Arrow Length For 28.5 Inch Draw. Most people have a draw length of around 28”, so arrows between 29 and 30 inches long are best for them. Your amo arrow length with a newer bow would be about one inch shorter than your draw length (3/4 actually).
Draw the bow and have your buddy mark the arrow about 1 inch from the riser, then release the arrow and measure to the mark. For every 3 grains of total arrow weight above draw weight multiplied by 5, subtract 1 ft/s from the ibo value. Ilf risers & bowlength information.
The right answer is to cut them to the length that creates the proper spine for your setup. For most archers (27 to 30 inch draw length and 60 to 70 pound draw out of a modern compound bow), an arrow weighing between 420 to 450 grain tends to lead to a great balance of speed and energy to be effective for hunting. But your arrows might not have to be 30 inches, either. For every inch of draw length above 30″, add 10 ft/s to the ibo value.