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The first 56 is the diameter of the case at the base .56 inches (14.2 mm), measured just past the rim, and the second 56 is the diameter at the case mouth, also 0.56 in (14 mm). Later versions of the cartridge included the .56-52, .56-50, [ 2 ] and .56-46, which had varying degrees of taper in the cases, to accommodate smaller diameter bullets.
Cartridges were loaded with 45 grains (2.9 g) of black powder, and were also available as .56-52, .56-50, [15] and a wildcat .56-46, a necked down version of the original .56-56. Lugs indicates that the .50 calibre was the standard issue rifle, with a reduced diameter bullet to reduce the recoil and the risk of accidental magazine explosions. [15]
32 gauge — .526 in (13.4 mm) 28 gauge — .550 in (14.0 mm) 24 gauge — .579 in (14.7 mm) 20 gauge — .615 in (15.6 mm) 16 gauge — .663 in (16.8 mm) 14 gauge — .693 in (17.6 mm) 12 gauge — .729 in (18.5 mm) 10 bore — .775 in (19.7 mm) 8 bore — .835 in (21.2 mm) 6 bore — .919 in (23.3 mm) 4 bore — 1.052 in (26.7 mm)
Length; system unit code (other) symbol or abbrev. notes conversion factor/m combinations SI: gigametre: Gm Gm US spelling: gigameter 1.0 Gm (620,000 mi) megametre: Mm Mm US spelling: megameter
The Model 1868 was also the first trapdoor conversion to use the cartridge extractor covered by U.S. Patent No. 68,009, issued August 27, 1867 to W.H. & G.W. Miller. The Model 1868 had an overall length of 51 7 ⁄ 8 inches. [1] Over 50,000 Model 1868 rifles were manufactured, chambered for the .50-70 450 cartridge.
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Can someone have a look at File:Breech-Loader Cartridges.1860s.jpg, is the cartridge described as the 56-50 the 56-56, the description links here although the description is different. Is the description a typo, 56-50 in my mind would suggest bottle shaped cartridge. I originally added the pic to this page but got cold feet over the discription.
For instance the same angle of 0.1 mrad will subtend 10 mm at 100 meters, 20 mm at 200 meters, etc., or similarly 0.39 inches at 100 m, 0.78 inches at 200 m, etc. Subtensions in mrad based optics are particularly useful together with target sizes and shooting distances in metric units. The most common scope adjustment increment in mrad based ...