wind gypsy explained: H1000 is simply very sluggish burning for the 300wsm which might be why you're not getting data. H4381, RL23, RL26, 7828 seem to be the sweet spot for heavies but h4350 is a popular powder however too. Simply click to expand...This extruded powder is often a member of Hodgdon's Excessive number of powder with sluggish-burning