500 metres with reliable accuracy requires a powerful cartridge throwing at least 140 grain bullets at 3000 fps, a longish barrel (24-26") to burn all the powder, medium contour to prevent barrel whip and give it enough weight to absorb some recoil, good quality scope and rings, and a lightweight bipod is useful. All-up weight will probably be 4.5-5 kg. Lighter rifles are available, of course, but lack the consistent reliability you need for long shots, plus they are less pleasant to shoot. Some suggested calibres are 6.5PRC, .270 Win, .280 Rem, 7mm Rem Mag .30/06, .300 Win Mag. The 6.5PRC and .280 are more difficult to find ammo for.
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