Designed by Capt. W. L. Carpenter, 9th U.S. Infantry, in 1897,[1] the .25-21 was based on the longer .25-25.[1] It was Stevens' second straight-cased cartridge (after the .25-25)[2] and would be used in the single shot Model 44 rifle, as well as the Model 44+1⁄2, which first went on sale in 1903.[2] In addition, it was available in the Remington-Hepburntarget rifle.[1]
While the .25-25 was popular, the .25-21 offered "practically the same performance and was a little cleaner shooting."[2] It was also found the usual 20 or 21gr (1.30 or 1.36g)black powder charge of the shorter, bottlenecked .25-21 offered "practically the same ballistics" as 24 or 25gr (1.56 or 1.62g) in the .25-25. It was highly accurate, reputedly capable of generating .5in (12.7mm) groups at 100yd (91m).[1]
Barnes, Frank C., ed. by John T. Amber. ".25-21 Stevens", in Cartridges of the World, pp.74 & 123. Northfield, IL: DBI Books, 1972. ISBN0-695-80326-3.
______ and _____. ".25-25 Stevens", in Cartridges of the World, p.75. Northfield, IL: DBI Books, 1972. ISBN0-695-80326-3.
______ and _____. ".25-20 WCF", in Cartridges of the World, p.20. Northfield, IL: DBI Books, 1972. ISBN0-695-80326-3.
______ and _____. ".32-20 Winchester", in Cartridges of the World, p.46. Northfield, IL: DBI Books, 1972. ISBN0-695-80326-3.
______ and _____. ".38 Colt Super Automatic", in Cartridges of the World, p.46. Northfield, IL: DBI Books, 1972. ISBN0-695-80326-3.
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