45-70 Govt. - Project of Experiments (Cartridge Ballistics Poster) Hand-sketched Originally drafted in March of 1875. Includes a brief description and summary of the chart findings. 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. Poster is 15x37