|Type||Derringer / Handgun|
|Place of origin||United States|
|Designer||National Arms Company|
|Variants||.41-100, .41 Short Derringer, .41 Rimfire, .41 Long|
|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)|
|Test barrel length: 3"
Source(s): "Cartridges of the World"
The .41 Rimfire Cartridge was first introduced by the National Arms Company in 1863 and was also known as the .41 Short and the .41-100. In most designations like this, the second number refers to the black powder load, though in this case it means "41 hundredths of an inch".
The .41 Short was created with the intention that it be used in a small, single-shot derringer, which likely is the reason for the very low ballistics (most derringers were and are chambered for cartridges that were not originally intended to be used in such a small weapon). Remington Arms began producing their famous Remington Model 95 over/under double barrel derringer chambered for the .41 Rimfire cartridge in 1866.
According to Cartridges of the World, the .41 Rimfire consisted of a 130 grain (8.4 g) lead bullet propelled by 13 grains (0.8 g) of black powder in its original load. The round produced a muzzle velocity of 425 feet per second (130 m/s) and a muzzle energy of 52 foot-pounds force (71 J). However, more recently firearms writer Holt Bodinson has disputed these findings. He states that his testing showed the 130 grain bullet traveled at 685 feet per second (209 m/s) so producing 111 foot-pounds force (150 J) of energy - a significant difference in ballistic energy from the earlier tests. The difference in findings can potentially be attributed to variances in the specific ammunition fired or measuring equipment used.
- Barnes, Frank C. (2006) . Skinner, Stan, ed. Cartridges of the World (11th ed.). Iola, WI, USA: Gun Digest Books. pp. 483, 491–492. ISBN 0-89689-297-2.
- Wright, Bob. "Old cartridge boxes". The Firing Line. Retrieved 7 July 2013.
- "Henry Deringer’s Pocket Pistol". Retrieved April 29, 2016.
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