All plastic polycarbonate shot shell with star crimp

Claim 1

A charged shot shell having an all plastic case comprising: a molded polycarbonate plastic case with substantial stiffness and tensile strength, the tubular wall of the case having a substantially cylindrical outer surface, and the wall having a star crimp formed at the open mouth end of the case wall to confine the charge of the shot shell, the case wall having a bend at the periphery of the star crimp and adjacent the substantially cylindrical wall and the crimped mouth portion of the case extending evenly radially along the crimp folds and then smoothly joining the cylindrical case wall at said bend, the case wall being tapered at the inner surface thereof from a location below said bend and toward the end edge of the open mouth of the shot shell case wall, said all plastic case wall being reduced progressively in thickness at said bend and toward the open mouth therefrom, the wall being tapered in thickness to substantially a minimum adjacent the end edge at thE open mouth, the being being no more than 90* to minimize the folding of the case wall at the periphery of the star crimp, the bend at the periphery of the star crimp being rounded and not sharply angular, and the plastic case wall extending from said bend away from each other and along the case wall and into the star crimp and not being folded back upon itself.