Note that the equal volume load will give approximately a 2 dram load per ounce of shot. Multiply the oz load you shoot by 2 & it will give the approximate dram load for the equal volume. This equal volume load is on the fringe of More Shot, Less Lead. Note the load markings on commercially loaded shells, even those of 100+ years ago & you will see most are/were loaded with a heavier powder charge than this equal volume amount..

Miller/TN
I Didn't Say Everything I Said, Yogi Berra