Estimating arrow speed with 60 lbs. bow based on IBO speed.
The Bowtech Patriot Dually's IBO speed is 326-334 fps., but that's based on 70 lbs. pull. Is there any way to estimate the speed of this bow or any other bow for that matter with a 60 lbs. pull? I'm debating getting a speed bow (Dually, Supertec, etc.) in 50-60 lbs. pull and bottoming out the limb bolts and possibly shooting the bow at 60-62 bls. vs. getting a slower smoother drawing bow in 70 lbs. pull. Which would be faster? Is there some mathmatical formula for calculating bow speed at 60 lbs. based on advertised 70 lbs. IBO speed? Thanks.