IMR 7828SSC Smokeless Powder 8 Lbs, this magnum rifle powder has exactly the same burn speed as standard 7828 and uses the same data. However, due to the super short kernels, metering is virtually as good as a spherical powder. This allows up to 4% more powder space in the case and in many loads yields more velocity than standard 7828. Such loads are marked with an asterisk in the data to show where standard 7828 will not fit. Grain shape is extruded (stick).