Yep. Full Episode of Lee Ermy's "Mail Call" show dedicated to the Knob Creek Machine Gun shoot. The Gunny is getting up there a bit, but he looks like a kid in a candy store during a couple of those segments.
I think I may have figured a way to cheat the devil on the lead insert.
BUCKSHOT.
here's a table with shot#, diameter, # of pellets per ounce:
Size _ Diameter ______________ Pellets/oz
#000 diameter .36" (9.1 mm)__ 6 pellets/oz
#00 .diameter .33" (8.4 mm)__ 8 pellets/oz
#0 ..diameter .32" (8.1 mm)__ 9 pellets/oz
#1 ..diameter .30" (7.6 mm)_ 10 pellets/oz
#2 ..diameter .27" (6.9 mm)_ 15 pellets/oz
#3 ..diameter .25" (6.4 mm)_ 18 pellets/oz
#4 ..diameter .24" (6.0 mm)_ 21 pellets/oz
#2 ..diameter .27" (6.9 mm)_ 15 pellets/oz
hrmn...
that looks like my best option.
might be time to buy (and gut) me some shotshells loaded in #2 buck.