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When you get to the range sight in dead on at 20 then back off to 40 and set the speed dial. It works a lot easier than going from 20 to 30 yards and saves a lot of adjustments doing so.
With most Excaliburs you can figure you will loose 1 fps for each 3 grains of weight you add. So using a 150 grain head you will be shooting 400 grains which is 50 grains over the 350 grains Excal uses to rate the bow. 50 divided by 3 is approx a loss of 17 fps.
With most Excaliburs you can figure you will loose 1 fps for each 3 grains of weight you add. So using a 150 grain head you will be shooting 400 grains which is 50 grains over the 350 grains Excal uses to rate the bow. 50 divided by 3 is approx a loss of 17 fps.