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I'm curious. i've seen overshot wads sealed with sodium silicate solution, AKA waterglass a several times. Have you ever heard of that?
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Yes, I used to use waterglass. I have since gone to Duco cement. The problem with waterglass is storage. If you use the shells in fairly short order, there is no issue. If you store them - from one season to another, let's say, the waterglass turns to powder and does not seal.
Duco is the best that I have found.
Also, it is possible to change the pistol primered CBC hulls to 209 primers by drilling out the primer pocket with a "B" drill (IIRC) or 15/64ths. This is best done with a small lathe as it is necessary to cut a recess for the rim of the 209s.
Or.....you can buy lathe turned hulls from Rocky Mt. Cartridge Co. and use standard one piece plastic 12 gauge wads and 209 size primers, BP or smokeless. You still have to seal with an OS card and nail polish of Duco.
Pete