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Other Accessories & Gear
The major components of sniper equipment are the sniper rifle, ammunition and camouflage. In modern U.S. Army parlance, the sniper rifle, optics, cleaning kits, cases, and other accessories are considered a "Sniper Weapon System" and are issued as a set. more...
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Other countries may have a similar policy.
Sniper rifles
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Historic military sniper rifles up to and including the Second World War were usually based on the standard service rifle of the country in question. They included the German Mauser Gewehr 98K, U.S. M1903 Springfield and M1 Garand, Soviet Mosin-Nagant, Norwegian Krag-Jørgensen, Japanese Arisaka, and British Lee-Enfield No. 4. Models used for sniping were generally factory tested for accuracy and fitted with specialized components, including not just optics but also such items as slings, cheekpieces, and flash eliminators.
Modern sniper rifles, from the 1960s onwards, have been increasingly purpose-built. The critical goal is reliable placement of the first shot within one MOA (minute of arc). Most include special features for this purpose, including tight building tolerances and precise components. Measures are also taken to ensure the rifle is affected as little as possible by heating, vibration and other effects which may reduce accuracy.
Ammunition
Most snipers are issued with specially developed and manufactured match-grade military ammunition. This ammunition is typically manufactured to higher tolerances and therefore provide improved accuracy over standard military ammunition.
This ammunition often features a boat-tail (narrowing at the base end), because it provides better ballistic performance due the reduced air resistance (drag).
Though target shooters often assemble their own ammunition from components to more precisely control the load and tune it to the specific rifle and task, this is practically unknown in military and police circles (as this may interfere with various laws regarding due process and NATO codes).
Ideally, a shooter would acquire rounds from a single lot (batch) of manufactured ammunition, zero the rifle to that lot, and then use only that ammunition until it runs out. This ensures that every bullet is as similar as possible to the previous one, and assists consistency (as well as confidence). However this is rarely practicable. A sniper will enter information into a data, or DOPE (Data On Personal Equipment) book, such as lot number, temperature, wind speed/direction, humidity and altitude. If the same conditions are encountered again, the data is available to assist in making an accurate shot. Most information gathering must start over if the barrel is replaced, as each barrel has distinct characteristics.
Read more at Wikipedia.org
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