I got to agree with jmac on this one . Sounds like your bow is out of tune . Dont mean to offend but your set up sounds like one comonly sold at wal-mart. Not that this is bad but if so the bow is most asuradly out of tune . I busted a string last year while on the second day of a hunting trip which happend to be a Sunday well the town had no bowshop and the only option was wal-mart so I baught a Buckmaster set up from them .I tuned on this bow for several hours before it would group well out to 50 yrds.