Powder Through Expanding Dies permit charging the case while expanding the case mouth. The powder funnel adapter can be replaced with a Lee Auto-Disk-Powder Measure for fully automatic powder charging while the case mouth is being expanded.
These Lee powder thru expanding dies are excellent for those wanting to load real black powder on a progressive press. A funnel can be placed securely on top of the die making sure nothing is spilled while charging the case using one of the Lee dippers. Be sure to clean and dry the die when finished to avoid rust, as the BP residue is very hygroscopic.