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45-70 PROJECT OF EXPERIMENTS

  • The 45-70 Govt. Project of Experiments poster is a unique replica of the actual hand sketched report of the project of experiments conducted at the National Armory (Springfield, MA) and drafted in March of 1875.This chart displays the various experiments conducted using the .45 caliber bullet weighing between 200 grains and 800 grains, with powder charges between 10 grains and 140 grains, and barrel lengths between 1 inch and 12 inches. The test results show that the .45 caliber cartridge loaded with 70 grains of black powder and a bullet weight of 405 grains was the optimal choice for the service cartridge in the 32-5/8” barreled model 1873 trapdoor Springfield rifle.

    The findings of these experiments confirmed the validity and utility of the 45-70-405 (45-70 Government) as a viable infantry cartridge capable of volley fire well beyond that era's accepted limit of effective range.

    • Replica of the tests conducted with the .45 caliber bullet.
    • Contains the National Armory stamp
    • Created in 1875
    • Size: 14" tall by 38" wide
    • Not a standard poster size. If framing, look for an extra large frame that can be found at local craft stores or online.
    • Full color image
    • Heavy duty - 100lb poster paper with High Gloss finish.