Patent ID: 11448491

Abstract:
A cartridge has a polymer case with a mouth, a neck having a neck thickness (Tn), a shoulder, and a body having a case thickness (Tc). The body has a flat portion comprising a minimum thickness, a pull thickness (Tp), and a dip comprising a dip thickness (Tb). The cartridge also includes an insert attached to the polymer case opposite the shoulder. The insert can a bulge engaging the dip to maintain the insert on the polymer case. Tb and Tn are related by 1.0≤Tb/Tn≤1.5 or just <1.5. The ratio of the minimum thickness of the body to the neck thickness is between about 1.0 and about 1.5. The ratio of Tb to Tn includes, and/or the minimum thickness of the body to the neck thickness includes, but is not limited to, ratios of 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 1.35, 1.40, 1.45, and 1.50.