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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]
.56-46 Spencer.56-50 Spencer.56-52 Spencer.56-56 Spencer; 2.34mm SwissMiniGun; 4.5×26mm MKR; ... .360 bore — .360 in (9.1 mm).410 bore — .410 in (10.4 mm)
The original No. 56 became the .56-56, and the smaller versions, .56-52, .56-50, and .56-46. The 56–52, the most common of the new calibers, used a 50-cal bullet. Other black powder-era cartridges used naming schemes that appeared similar, but measured entirely different characteristics; 45-70 , 44-40 , and 32-20 were designated by bullet ...
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
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I'm far from being an expert... sorry if I said some nonsens or just wasn't helpful... Cheers! Kintaro 05:41, 12 June 2010 (UTC) Spencer rimfire cartridge .56-56 has base diameter of .56" and neck diameter diameter of .56". Spencer rimfire cartridge .56-50 has base diameter of .56" and neck diameter diameter of .50".
A caliber conversion device is a device which can be used to non-permanently alter a firearm to allow it to fire a different cartridge than the one it was originally designed to fire. The different cartridge must be smaller in some dimensions than the original design cartridge, and since smaller cartridges are usually cheaper, the device allows ...