Unless you are carrying the shells all day in your pocket, why do they have to be crimped at all. Some loaders use "water glass" to seal the over shot wad. I may go to the water glass sealant because crimping is such a pain. I have no idea how to get water glass, so I guess Duco cement may be a good substitute. I always loaded my 10 gauge blanks with no crimp. 3 1/2" shell filled to the brim holds a lot of black powder. I once shot a serious overload, and my Winchester cannon did a back flip off of a wood pile. It landed on soft asphalt and was not damaged.
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