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The Ordnance manual of 1861 provides thicknesses for the walls of both 12-pounder shell (0.66 - 0.74, "true" = 0.70 inch) and spherical case (0.425 - 0.475, "true" = 0.45 inch). For 6-pounder ammunition, only the thickness of spherical case (0.335 - 0.385, "true" = 0.36 inch) is given. Does...