you can flat make a thumper outa that! Pushing 430's outa my guidegun over healthy dose a RL-7. It will flat make you lose some fillings in your teeth. talk about anchor a bull in the dark timber though.
For those "lighter" 405's /ubbthreads/images/graemlins/wink.gif try starting just north of 40 grns or so of RE7 and work up.