Longer variant of the .46 Short Rimfire; used in early American pocket revolvers during the transition away from percussion arms.
Type: Rimfire
Introduced: 1866, United States
Parent case: Proprietary
Standardization: Proprietary
Bullet diameter: 0.454" (11.53 mm)
Rim type: Rimmed
Primer: Rimfire
Production status: Discontinued
Also known as: .46 Long RF
History: A lengthened version of the .46 Short Rimfire, the .46 Long was chambered in a small number of American revolvers in the late 1860s. Both .46 caliber rimfire cartridges became obsolete quickly as large centerfire revolvers (.44-40, .45 Colt) became the dominant frontier handgun cartridges.