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It was also found that the usual 20 or 21 gr (1.30 or 1.36 g) black powder charge of the shorter [3] 25-21 offered "practically the same ballistics" as 24 or 25 gr (1.56 or 1.62 g) in the .25-25. The switch to smokeless powder only exacerbated the problem, due to the small charge. [ 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 21 gr (1.30 or 1.36 g) black powder charge of the shorter, bottlenecked .25-21 offered "practically the same ballistics" as 24 or 25 gr (1.56 or 1.62 g) in the .25-25. It was highly ...