from (https://en.wikipedia.org/wiki/.41_Short)
Case type Rimfire, straight
Bullet diameter .405 in (10.3 mm)
Neck diameter .406 in (10.3 mm)
Base diameter .406 in (10.3 mm)
Rim diameter .468 in (11.9 mm)
Case length .467 in (11.9 mm)
Overall length .913 in (23.2 mm)
Primer type Rimfire