I just now saw this old thread. I wish that i had seen it months ago.
The best sealant/glue that I have used for brass hulls is , hands down, Duco cement.
I have used others - crazy glue, Elmers, water glass……Duco works better.
Here is a picture of one rig for a pheasant hunt: An old Parker DH and 12 gauge brass from Rocky Mt. Cartridge Co., 80 grains of FFg black, 1 1/8oz. of #6 shot.