The 7.62x51mm NATO bullet consists of a gilding metal jacket and a lead antimony slug. It is a boat tailed bullet (rear of bullet is tapered) and weighs 145 or 150 grains. The tip of the bullet is not colored. The base of the cartridge is stamped with the year of manufacture and a circle that has vertical and horizontal lines, sectioning it into quarters. Its spread (accuracy standard) for a 10-shot group is no more than 12 inches at 550 meters. However, the rounds used in Fallout are not NATO. In Fallout 3, .308 rounds were used, which are nearly identical to the 7.62x51 NATO round. In other Fallout games, the round referenced is actually 7.62x39, which are used by AKs.
7.62mm rounds are not likely to see much use, fitting only the FN FAL, its upgrades, and the rare M60. While slightly superior to .45 caliber, 7.62mm still lags with the bonuses of 5mm JHP, 4.7mm caseless, or 2mm EC, perhaps making its late game usefulness questionable. However, the FN FAL night sight can be of use early on, when darkness can hamper shooting skills.