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Bryant Ridge's Analysis:The Model 1870 rifle and carbine marked a notable improvement over the earlier “Trapdoor Springfield” models, yet the use of the .50-70 Gov’t cartridge revealed its inadequacies, prompting a trial in 1872 to select a more effective standard for the U.S. Army’s infantry and cavalry. In 1873, the slightly modified Model 1870 designs were adopted, now chambered for the newly developed .45-70 Government cartridge, which offered superior ballistic performance. This cartridge, …