.41 Remington Magnum (using Sierra bullets)
Date: Nov 21 2018
The .41 Remington Magnum was introduced in 1964 and developed as a joint effort between Remington and Smith & Wesson; however, it was Elmer Keith and Bill Johnson that convinced the two companies to work together on the project. The .41 was intended to fill the performance gap between the .357 and .44 Magnums. Initially it was offered with two loads that included a 210-grain lead SWC bullet at an advertised 1,050 fps (specifically for police applications) and a 210-grain JSP bullet at a claimed 1,500 fps. In testing early ammunition, velocities of both loads were overstated when fired from production revolvers, even those with 8-3/8 inch barrels. Today most companies have standardized on 210-grain JHP/JSP bullets at 1,300 fps, which is a realistic velocity in most sixguns. The .41 Magnum never achieved widespread acceptance within police circles (mostly due to the rather heavy Model 58 revolvers) and neither has it supplanted the popularity of the .357 and .44 Magnums. It remains an excellent general-purpose sixgun cartridges that has many dedicated fans. It is powerful, capable of taking big game and can produce outstanding accuracy.
Sierra 170-grain and 210-grain JHC bullets were found to be extremely accurate in the test gun, a Smith & Wesson Model 57 revolver with a 6-inch barrel. Many of the better loads would consistently stay within one inch at 25 yards. For factory duplication loads using the Sierra 210-grain JHC bullet, try 14.7 grains of Accurate No. 7, 17.9 grains of Accurate No. 9, 18.9 grains of Alliant 2400 or 21.0 grains of Hodgdon H-110 (or Winchester 296) for around 1,300 to 1,350 fps.
A heavy roll crimp is suggested to keep bullets from “walking out” when subjected to recoil, and aids with achieving proper powder ignition.