Mike A.,
Interesting, I use 444 cases(full length)in my .410 pistol(with papers, so don't send the BATF) to shoot carpenter bees.I load 3.5gr bullseye,two wads cut from a meat tray, filled almost to the top with ground walnut hull polishing media(could use grits), another wad,seal with carpenter's glue.This is a "magnum"load that does a really good job, but doesn't damage the underside of a tin roof.
Mike