M-Tecs
06-27-2022, 06:39 PM
This is a pay to use site but it does give you a powder type so calling the manufacture might get you loads data.
https://loaddata.com/Cartridge/25-21-Stevens-Cartridges-of-the-World/4701
Warning! Notes: Historical Notes: The 25-21 Stevens was developed about 1897 as a shortened version of the slightly older 25-25. First introduced for the 44 Stevens rifles and later available in the 44-1/2 series, it was designed by Capt. W.L. Carpenter of the 9th U.S. Infantry, who also designed the 25-25 Stevens. General Comments: The 25-21 was noted as a very accurate cartridge, reportedly capable of 1/2-inch, 100-yard groups. It gave about the same performance as the 25-20 SS, but was much too long for the standard repeating actions. It is easy to reload and quite pleasant to shoot. Use Lyman No. 25720 flat-point or No. 25727 hollowpoint cast bullets. The former weighs 86 grains, the latter 75 grains. Twenty to 23 grains of FFFg blackpowder, or the light smokeless powder loads listed can be used. (Cartridges of the World 11th Edition)
https://www.abebooks.com/Cartridges-World-11th-Edition-Skinner-Stan/31166010862/bd?cm_mmc=msn-_-comus_shopp_used-_-naa-_-naa&msclkid=48c862aeb3581367daf300148d44b9f5
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