Loads of handloaders in no way heard of “seasoning” a new powder measure by working a pound or so of powder as a result of it. The theory would be that the graphite coating within the powder granules (and from the dust at The underside of a can of powder) https://accuratepowderxmr-57441lb15702.ampedpages.com/facts-about-buy-imr-enduron-7977-smokeless-gun-powder-revealed-62361057