ORIGINAL: Slingshot455
My Diamond Marquis(Bowtech) at 64# 305gr went 304 to 306fps with a peep and tube. Dont know alot about bows but this is what mine did.
Not to be off topic but bud... you are shooting well under the 5gpp mark. you are shooting a 305gr arrow out of a 64# bow? that = 4.765625 gpp. you are voiding your bow warranty and asking for an arrow in the hand! just letting you know.
Derek