Plenty of handloaders never heard about “seasoning” a fresh powder evaluate by managing a pound or so of powder by means of it. The theory would be that the graphite coating around the powder granules (and during the dust at the bottom of the can of powder) will come off https://imr-green-smokeless-gun-p71368.amoblog.com/the-ultimate-guide-to-hodgdon-h4895-smokeless-gun-powder-57259509