338-calibre very-low-drag bullets up to 16.85 g (260 gr). The barrel has an unconventional 279 mm (1:11 in) right-hand twist rate, optimized for firing. The rifle is fitted with a stainless steel, fluted, 686 mm (27.0 in) barrel, which research has found to be the best compromise between muzzle velocity, weight, and length. 338 Lapua Magnum (8.6×70mm) calibre was designed as a dedicated long range sniper rifle. 300 Winchester Magnum barrel features a non-traditional 279.4 mm (1:11 in) right-hand twist rate.
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300 Winchester Magnum is fitted with a fluted, stainless steel barrel that is 660 mm (26 in) long for optimum muzzle velocity and nominal weight. For precision shooting, the Federal Cartridge's Gold Medal Match grade is the most commonly used ammunition. 300 Winchester Magnum chambering to obtain fairly high muzzle velocities, combined with relatively heavy and long very-low-drag bullets, significantly enhance the hit probability at longer ranges and hence the effective range compared to the 7.62×51mm NATO cartridge. 300 Winchester Magnum (7.62×67mm) cartridge was designed as a magnum hunting cartridge and offers a flatter trajectory and a significant increase in muzzle velocity, wind resistance and supersonic range over the dimensionally smaller 7.62×51mm NATO cartridge. The AWM rifle is normally supplied in a metal transit case together with a telescopic sight, mount, butt spacers, bipod, spare magazines, sling, cleaning and tool kits. The German and Russian Army prefer a telescopic sight made by Zeiss over Accuracy International's preference. Accuracy International actively promotes fitting the German made Schmidt & Bender PM II/MILITARY MK II product line as sighting components on their rifles, which is rare for a rifle manufacturer. However, a Schmidt & Bender PM II/MILITARY MK II with variable magnification of either 3–12×50, 4–16×50 can be used if the operator wants more flexibility to shoot at varying ranges, or when a wide field of view is required. Normally, the AWMs are outfitted with a Schmidt & Bender PM II 5-25×56FFP MILITARY MK II telescopic sight with P4F graticule. Muzzle brakes are fitted to reduce recoil, jump and flash and act as a base for optional iron sights and suppressors. The normal cartridges for this rifle, and the ones which have been accepted by NATO for use in AWM rifles, are. The AWM features a detachable single stack removable box magazine which holds five rounds. The bolt head, locking ring, and extractor and magazines were also revised to work with the increased size and operating pressures of magnum rifle cartridges. Compared to the AW, the AWM has a longer bolt to accommodate dimensionally larger magnum-length cartridges such as the. As such the design details of the AWM variant are similar to the ones found in the basic AW rifle system. The Accuracy International AWM sniper rifle is a variant of the British Accuracy International Arctic Warfare (AW) rifle that was the basis of a family of sniper rifles using the Arctic Warfare name. 338 Lapua Magnum AWM rifle was phased out and replaced by the Accuracy International AXMC sniper rifle. On 9 September 2012, Accuracy International announced that the.
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The Accuracy International AWM is also unofficially known as the AWSM (Arctic Warfare Super Magnum), which typically denotes AWM rifles chambered in. The Accuracy International AWM (Arctic Warfare Magnum or AI-Arctic Warfare Magnum) is a bolt-action sniper rifle manufactured by Accuracy International designed for magnum rifle cartridges.