I have selected allow streching and added a x=500 y=500 limit to the IK node but my skeletal mesh never streches to reach the target. I am using the thirdperson character. Any insight?
Well if a value is interpolated to a max value of 500 then that max value will never be achieved as an absolute so as an absolute you will need to clamp the max value as part of a higher seed value. If you make the max value of the IK say 1000 and clamp the max allowed value to 500 then your IK should then hit the max target value.