Ulrich -
I sold my 4" S&W 624 several years ago, but recall my favorite load as follows:
LBT 260WFN-PB / .432" / 10BHN
VV N-330 / 6.8 grains
Federal LP primers
Starline .44 SPL Brass
It was an accurate load in that revolver - pleasant to shoot, with plenty of punch.
Note that the bullets were sized for a firm finger pressure push through, of the cylinder throats. Cast bullets that were a loose / drop through fit of the cylinder throats, tended to lead the bore rather quickly.
