what caliber gun do they shoot in the biathlon in the olympics
Biathlon The biathlete carries a small-bore rifle, which weighs at least 3.5 kilograms (7.7Â lb), excluding ammunition and magazines. The rifles use .22 LR ammunition and are bolt action or Fortner (straight-pull bolt) action. The rifle must weight more than 3.5 kilograms. Each rifle holds 4 magazines with 5 rounds each. Addtional rounds can be kept on the stock of the rifle for a relay race.
BB gun BB guns are a type of air guns designed to shoot metallic ball projectiles called BBs — metal balls approximately the same size as the 0.180 inches (4.6 mm) "BB" lead birdshots. Modern BB guns usually have a barrel with a bore caliber of 4.5 mm (0.177 in) and are available in many varieties. These guns usually use steel BB shots, either zinc- or copper-plated to resist corrosion, and measuring 4.3 to 4.4 mm (0.171 to 0.173 in) in diameter and 0.33 to 0.35 g (5.1 to 5.4 gr) in weight. Some manufacturers still make the traditional lead balls around 0.48 to 0.50 g (7.4 to 7.7 gr) in weight and slightly larger in diameter, which are generally intended for use in rifled barrels due to lead having better malleability.