NiWS, great to hear of your good experience shooting 300m and 500m - well done! I hope that the hook is well and truly set in you now... ;-)
Sounds like you and your rifle acquitted yourselves well. You can now try tweaking your existing load (though it sounds pretty darn good!), or perhaps try higher performance bullets for less wind drift (the various 75-grain HPBTs). But whether or not you do that, you have already shown that what you have is a pretty good setup (as you noted, minute-of-coyote out to 500m is not bad, eh?!)
tried out a half box of hornadt TAP ??? 75 grain HBPT and rifle loved them at 500 meters
how do i replicate powder on this load any suggestions????