You are over thinking this and not making much sense.
Load your Brass Hulls in the usual mannor,place a over shot Wad and glue it in place with a Hot Glue Gun.
You are going to have to resize your Brass Hulls after firing.
Or take regular plastic hulls,cut off the star crimp,load them in the usual mannor and roll crimp the over shot wad in place.
Wether they are 2" or two and a half inches wont really make any odds,those to measurements are the cartridge length before firing.
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