Hodgdon 48311S Extreme H4831SC Rifle Powder Multi-Caliber 1 lbH4831SC is an Extreme extruded powder and the exact ballistic copy of H4831. Physically, it has a shorter grain size which earned it the SC designation for short cut. The shorter, more compact kernels allow the powder to flow through the powder measures more smoothly, helping to alleviate the constant cutting of granules. With the smoother flow characteristics comes more uniform charge weights, while the individual grains orient more compactly,