OK, so it arrived today, and I waisted little time in trying it out.
The kit consists of a brass catcher (identical to the boolit catcher on the sizing kits), a small (and short) push-rod, and a sleeve that adapts the FCD to either the brass catcher, or a Lee Loadmaster guide tube.
The first thing I noticed is the pusher has a recess in the top, probably to allow use of the kit with loaded ammo.
Here is the factory crimp die. Take it apart, remove the crimp bushing (center) and thread the adapter into the FCD body. It doesn't show up in the photo but there is a small chamfer on one end of the crimp bushing. Make sure to put it back together correctly, or your FCD will be primed to ruin ever round put through it!
Here is the kit ready to use on my Rockchucker.
I did not have any truly bulged brass readily available (I can round some up easy enough), so I just took some once fired brass and ran it through. I used Winchester brass, and compared it to new Winchester factory ammo.
Here are the results:
New Factory ammo, diameter at base: 0.421"
Once fired range pickup, diameter at base: 0.429"
After sizing, base diameter: 0.422"
Nowhere near scientific as I only sized a few, but it looks promising.
I will sort through my range pickup brass and try to find some obvious Glock brass and then I will compare the "Bulgebuster" to my standard carbide sizer.