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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.
In World War I 45-caliber naval gun barrels were typical, in World War II 50- to 55-caliber barrels were common, with Germany already manufacturing tank guns of 70 calibers by 1943. Today, 60- to 70-caliber barrels are not uncommon, but the latest technology has allowed shorter barrels of 55 calibers to attain muzzle velocities of 1,750 m/s ...
*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
The model 1884 was also produced in a carbine version. It was found that the rear sight could be easily damaged when removing the rifle from the carbine boot. The rear barrel band was therefore modified in 1890 to include a rear sight protector. A round-rod bayonet model was also produced, designated the Model 1888.
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.
Thus, a 10-gauge shotgun has a larger-diameter barrel than a 12-gauge shotgun, which has a larger-diameter barrel than a 20-gauge shotgun, and so forth. M35 .410 shotgun cartridges for M-6 survival gun w/.22 long rifle for comparison. The most popular shotgun gauge by far is 12-gauge.
The Ruger #3 is a single-shot rifle produced by Sturm, Ruger & Co from 1973 to 1986. It is based on the Ruger #1, with some modifications made to reduce costs, such as a simpler one-piece breech lever. [3]