Arrows: The [Critical] Difference between GPI and GPP

Grain Per Pound versus Grains Per Inch

JJ at Bob Lee Bows explains the importance of calculating the correct Grains Per Pound (GPP) for the arrows you pair with your traditional bow, and he’ll explain why Grains Per Inch (GPI) is so often confused with this critical measurement and how to distinguish between the two for the best performance (and protection) of your recurve or longbow.