dctkennels,

Is your bow set up for hunting? IBO speeds are set with a bare bow, basically. NO silencers on the strings, no loop, no peep, etc.... At 70 lb. draw weight and a 30 inch draw, with a 350 gr. arrow.

Shorter draw length, lower draw weight, heavier arrow, and the items most hunting set ups have on the string will all lower your speed through a chrono.

It is typical for all bow set ups to be lower than IBO. That type of set up used to be called AMO speed. I am not sure if that is still the reference name for it or not, but depending on how your bow is set up there might not be anything wrong. If your set up is close to the IBO reference, you may need to have your bow checked again. Also, do not go with the first shot through a chrono. The first shot is often off a bit. Fire several shots and kick out the first and average the rest. That will give you a more true representation. Also, make sure you are shooting through the chrono windows at the right level. High or low will read incorrectly.

God bless