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In 1884, the US Ordnance Department increased the bullet weight of the 45–70 to 45–70–500, or a 45 caliber bullet, 70 grains of black powder, and a 500 grain bullet. [3] The new 45-70-500 loading was recorded with a muzzle velocity of 1315.7 feet, and generated 1525 ft lbs of energy at 100 yds, and 562.3 ft lbs of energy at 1,000 yards ...
The bore angle is set to ensure that a bullet on a parabolic trajectory will intersect the LOS to the target at a specific range. A properly adjusted rifle barrel and sight are said to be "zeroed." Figure 3 illustrates how the LOS, bullet trajectory, and range ( R H {\displaystyle R_{H}} ) are related.
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.
In cartridges surviving from the black-powder era (examples being .45 Colt, .45-70 Government), the case is much larger than is needed to hold the maximum charge of high-density smokeless powder. This extra room allows the powder to shift in the case, piling up near the front or back of the case and potentially causing significant variations in ...
Handguns are typically less accurate; at a shooting distance of 25 yd, a grouping is considered acceptable for self-defense if the shots fall within a circle of 4 to 5 inches, which is 15 to 19 MOA (equivalent to a grouping of 100-150 mm at 25 meters, which is 4-6 mils), [9] representing the shot pattern needed to hit the vital organs of a ...
With a 200 yard zero, the ballistics chart looks like this: yds inches; 100 +11.5; 200 0; 300 -41.1; 400 -116.5; 500 -230.1; So a 200 yard ain't gonna cut it for a max point blank range on a deer, that 11.5" hump puts you right over the back of the deer. scot 15:51, 31 May 2006 (UTC)
For instance a professional shooter may be able to repeatably hit a given size target, i.e. a 100 mm ring, at 1000 meters (0.1 mil target difficulty) in low and predictable wind, while the same 100 mm target may be near impossible to hit in heavy and varying wind at 200 meters (0.5 mil target difficulty).
Observers report where shots fall so that aim may be corrected. In the First World War an important task for aircraft — both heavier-than-air or balloons — was artillery spotting . In naval use several ships may be shooting at the same target, making identifying the fall of shot from a particular ship difficult; different-coloured dyes for ...