Remington made the Model 95 over-under, double-barreled Derringers until 1935. They were chambered for several rimfire cartridges, all of them underpowered by today’s standards. The most common of them was the .41 rimfire, which used a 130-grain lead bullet propelled by 13 grains of blackpowder. Muzzle velocity was only 425 feet per second, and it’s said that you could see the bullet in flight. Muzzle energy was just 52.2 foot-pounds, only about 2/3 of the energy of a .22 Short; in fact, reports are that the bullet from the .41 Derringer would bounce off a hard object like a tree. Still, the guns were popular because they were small and easy to hide.