ky-- i would stay far away from the hv turkey loads. i know most will disagree but i shoot the 500 also and i can not get any thing close to a reasonable pattern from any hv' s. i know there was a post about the 500 with certain chokes a couple weeks ago and there were several others that had the same experience with the hv' s. however the one that was recomended on the post was either the federal premiums #5 or the winch. double X #5' s like you asked about. anywho i hope this helped you out but let me know what you find out. i just bought a star dot chike for my 500 (heard that they go good together---we' ll see)