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5.56 info, barrel length
The Swedish military has measured the bullet velocities of SS109/M855 military cartridges at 4 m (13.1 ft) from the muzzle fired from differing barrel lengths:[24]
Barrel length SS109/M855 V4 bullet velocity V4 velocity loss
210 mm (8.3 in) 723 m/s (2,372 ft/s) 41 m/s (135 ft/s)
240 mm (9.4 in) 764 m/s (2,507 ft/s) 32 m/s (105 ft/s)
270 mm (10.6 in) 796 m/s (2,612 ft/s) 29 m/s (95 ft/s)
300 mm (11.8 in) 825 m/s (2,707 ft/s) 18 m/s (59 ft/s)
330 mm (13.0 in) 843 m/s (2,766 ft/s) 23 m/s (75 ft/s)
360 mm (14.2 in) 866 m/s (2,841 ft/s) 12 m/s (39 ft/s)
390 mm (15.4 in) 878 m/s (2,881 ft/s) 14 m/s (46 ft/s)
420 mm (16.5 in) 892 m/s (2,927 ft/s) 14 m/s (46 ft/s)
450 mm (17.7 in) 906 m/s (2,972 ft/s) 9 m/s (30 ft/s)
480 mm (18.9 in) 915 m/s (3,002 ft/s) 7 m/s (23 ft/s)
508 mm (20.0 in) 922 m/s (3,025 ft/s) -
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