Project of Experiments Poster
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45-70 Gov. – Project of Experiments


Hang a piece of American history on your wall. This unique poster is a replica of the actual hand sketched chart of experiments conducted at the National Armory (Springfield, MA) and drafted in March of 1875.

Poster Size: 38X14

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Product Description


This chart shows experiments using the .45 caliber bullets weighing between 200 grains and 800 grains, powder charges between 10 grains and 140 grains, and barrel lengths between 1 inch and 12 inches. The test show that the .45 caliber cartridges 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 limited of effective range. …And it just looks cool.


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