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Expensive and well-machined match-grade pistols demonstrate a higher accuracy than normal handguns, capable of groupings of 1.25 inches at 25 yards, which is about 5 MOA (equivalent to about 30 mm at 25 meters, which is 1.2 mil). [10]
For 5-shot groups, based on 95% confidence, a rifle that normally shoots 1 MOA can be expected to shoot groups between 0.58 MOA and 1.47 MOA, although the majority of these groups will be under 1 MOA. What this means in practice is if a rifle that shoots 1-inch groups on average at 100 yards shoots a group measuring 0.7 inches followed by a ...
[11] to distinguish them from telescopic sights or "Riflescopes". The sights move in the vertical and horizontal planes in fixed increments of (typically) 1/4 minutes of angle (MOA); as a rule of thumb, moving the sight by 1 MOA moves the impact of the shots by 1 inch (25 mm) per hundred yards distance of the target from the rifle.
Conversion of various sight adjustment increment Increment, or click (mins of arc) (milli-radians) At 100 m At 100 yd ()()()()1 ⁄ 12 ′ : 0.083′ 0.024 mrad 2.42 mm
The common .375 CheyTac 292 mm (1:11.5 in) rifling twist rate also has to be tightened to stabilize very long projectiles. The use of such a .375 CheyTac based cartridge demands the use of a custom or customized rifle with an appropriately cut chamber and a fast-twist bore.
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).
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[4] [5] The 2009 Precision Sniper Rifle requirements stated that the PSR when fired without suppressor should provide a confidence factor of 80% that the weapon and ammunition combination is capable of holding 1 MOA extreme vertical spread, calculated from 150 ten (10) round groups fired unsuppressed. No individual group to exceed 1.5 MOA (0.5 ...