For glue on the overshots, I tried several, including duco (which works but is a PIA, white glue, hot glue, and I dunno what else, and ended up using Elmer's Probond woodworkers glue. It is A: CHEAP (like 16 ounces for $6), B:, stickier than white glue, and C: pretty near waterproof. Even when rough handled or dropped, never had a failure.
I just line up the assembled shells and put a drop in the mouth of each one, then go back and swish it around with a Q-tip and call it good. Let stand an hour or so and ya can box em up without fear of the glue migrating. Most time after firing the little bit that is left in the case mouth is no bother, and provides a bit of "grip" for the next glue job.
I am gonna try annealing and roll crimping a few with a reducer and a universal fine adjustment tool (hammer) and see how I like that