Relative size of cartridge cases required to give identical ballistic characteristics to same bullet when propelled by (left) black powder, (center) conventional smokeless powder, and (right) spherically grained Olin Ball Powder.
Digital Commonwealth — Boston Public Library

Relative size of cartridge cases required to give identical ballistic characteristics to same bullet when propelled by (left) black powder, (center) conventional smokeless powder, and (right) spherically grained Olin Ball Powder.

[ca. October 1952]

CC0 — Public Domain
Digital Commonwealth — Boston Public Library

[Information from item housing] Guns & Ammunition Misc.

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