The WAA16 wad, now available as the CB0100, was originally intended for the Winchester/Western compression formed 16-gauge hull (Super-X, UPLANDER and DOVE & QUAIL) with tapered side walls, not the current straight sided Olin trash hulls.
Compression Formed 16s 01.jpg
Compression Formed 16s 02.jpeg
How is the powder migration issue?
I'm still loading my supply of the compression formed 16-gauge hulls with the load that sports the * in the Ball Powder Loading Guide -- Win 209, 20 grains WSF, WAA16 wad and 1 ounce of shot. When Olin quit making the WAA16 I cleaned out Green Top Sporting Goods entire supply. Just about the time I was running out Clay Buster came to the rescue.
For 7/8 ounce loads I'm using the Down Range DR16 in Federal hulls.