"Every arrow that leaves the shop will be at least 5 grains per inch which is the industry standard that all bow makers use. if your bow is rated 70lb then your arroe will be 350gr total weight, if your bow is rated 60lb then we can go to 300gr total weight. You can shoot the 200 or 300 pro's without hurting your bow. you will loose 4 fps with the 300 arrows but gain 2lb energy. your 200 arrows are 4.9gpi approx and your 300 arrows are 5.1 gpi approx. neither will hurt your bow."

This is the e-mail from the pro shop, however, when weighed, my arrows fall way short of the required weight. What ya think??