Hoot wrote:Not to send yet another thread off on a tangent, but WRT the Styrofoam plug ...
Following Hoot's tangent a little further --
For fire forming, I've tried a lot of case sealers over Cream of Wheat, including wadded tissue & paper towels & TP, three different kinds of glue, silicon sealer, paraffin (both melted and cut), candle wax drippings, and even stryofoam. The best material I've found is Dairy Wax. We used some a couple of months ago in forming 8x58RD from 8x56R for a very old European Rolling Block rifle.
Dairy wax is the coating on some cheeses that seals them against atmospheric oxidation, and prevents mold growth. It's usually colored red or yellow or black. I get my supply in ready-to-use form by buying the cheeses at the grocery store and peeling the wax off the cheese after it's sliced. The wax is sticky and tacky, and the thickness is just about right for sealing cases. I store the peels in a jar with a tight lid, and the tackiness seems to last a bit longer. (If you're doing hundreds of cases, the dairy wax is available cheaply in chunks that need to be melted and poured to form a sheet: amazon.com will get you started.)
In use, after stuffing the COW (or grits) into the case, just press the wax sheet over the case mouth, and it cookie-cutters nicely to seal the case. It sticks to the brass very well, altho I haven't tried chambering a case from the mag in a semi-auto. I might try a double wad plug if the case were going to be thumped around.
--Bob
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Pic of cheese slice with red dairy wax coating