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H&R Model 155 'Shikari' '': Year of Manufacture: 1973-1981, These were single-shot break available in 12ga, 20ga shotgun barrels along with 44mag, 45-70 govt. rifle barrels with an under-barrel cleaning rod.
The .45-70 (11.6x53mmR), also known as the .45-70 Government, .45-70 Springfield, and .45-2 1 ⁄ 10" Sharps, is a .45 caliber rifle cartridge originally holding 70 grains of black powder that was developed at the U.S. Army's Springfield Armory for use in the Springfield Model 1873.
According to the US Army Ordnance Department tests, the 45-70-405 was loaded to 19,000 psi, [4] while the 45-70-500 was loaded to 25,000 psi [2] The average accuracy of the Springfield Model 1873 was a circle with an average radius of 1.7 inches at 100 yards, corresponding to an ~3.4 MOA.
The minimum barrel length for shotguns in most of the U.S. is 18 inches (460 mm), and this barrel length (sometimes 18.5–20 in (470–510 mm) to increase magazine capacity and/or ensure the gun is legal regardless of measuring differences [3]) is the primary choice for riot shotguns. The shorter barrel makes the weapon easier to maneuver ...
*Of which a length of 10.16 mm of the shank has its diameter reduced to 20.45 mm: 17/20"-12 Remington Rolling Block No. 1-1/2 Rem., Sporting Action [6]: 33 Sq21.59: 2.117 mm 90° 36.65 mm* Square threads. Also written as 0.850"-12. *Of which a length of 12.70 mm of the shank has its diameter reduced to 20.32 mm: 17/20"-12
Combat shotgun, Riot control weapon ... (with 12 in barrel) Barrel length: 191 mm (7.5 in) ... The trigger group is attached to a .410 bore or .45/70 Government ...
As far back as 1787 a Frenchman by the name of M. Magne de Marolles gave an account of choke-boring, though he argued against it. [3]Some sources state that the first pioneer was a Czech named Dominik Brandejs, who made shotguns with a choke in order to reduce the dispersion of shots, but his design was not popular in the 1820s.
Other barrel makers pushed beyond the limits the factory set, and chambered Contender barrels in lighter .308-class cartridges like the .243 Winchester. The Contender can fire .410 bore shotgun shells, either through the .45 Colt/.410 barrel or through a special 21-inch (530 mm) smoothbore shotgun barrel.