I didn't find a drawing, only these numbers:
Specifications
Bullet diameter .500 in (12.7 mm)
Neck diameter .526 in (13.36 mm)
Base diameter .526 in (13.36 mm)
Rim diameter .556 in (14.12 mm)
Rim thickness .056 in (1.42 mm)
Case length 1.625 in (41.28 mm)
Overall length 2.10 in (53.34 mm)
Primer type Large pistol