sport otto olsen 
American ___MASK6___ , referred to as ___MASK6___ in the United States and Canada , and also known as gridiron , is a sport played by two teams of eleven players on a rectangular field with goalposts at each end . The offense , the team with control of the oval - shaped ___MASK6___ , attempts to advance down the field by ___MASK38___ with or passing the ball , while the team without control of the ball , the defense , aims to stop their advance and take control of the ball for themselves . The offense must advance at least ten yards in four downs , or plays , or else they turn over the ___MASK6___ to the opposing team ; if they succeed , they are given a new set of four downs . Points are primarily scored by advancing the ball into the opposing team ' s end zone for a touchdown or kicking the ball through the opponent ' s goalposts for a field goal . The team with the most points at the end of a game wins . A rifle is a firearm designed to be fired from the shoulder , with a barrel that has a helical groove or pattern of grooves (" rifling ") cut into the barrel walls . The raised areas of the rifling are called " lands ," which make contact with the projectile ( for small arms usage , called a bullet ), imparting spin around an axis corresponding to the orientation of the weapon . When the projectile leaves the barrel , this spin lends gyroscopic stability to the projectile and prevents tumbling , in the same way that a properly thrown American ___MASK6___ or rugby ball behaves . This allows the use of aerodynamically - efficient bullets ( as opposed to the spherical balls used in muskets ) and thus improves range and accuracy . The word " rifle " originally referred to the grooving , and a rifle was called a " rifled gun ." Rifles are used in warfare , hunting and shooting sports . The word bullet is a firearm term . A bullet is a projectile expelled from the barrel of a firearm . The term is from Middle French and originated as the diminutive of the word boulle ( boullet ) which means " small ball ." Bullets are made of a variety of materials . They are available singly as they would be used in muzzle loading and cap and ball firearms , as part of a paper cartridge , and much more commonly as a component of metallic cartridges . Bullets are made in a large numbers of styles and constructions depending on how they will be used . Many bullets have specialized functions , such as ___MASK8___ , target ___MASK52___ , training , defense , and warfare . A ___MASK84___ is a competitive sport involving tests of proficiency ( accuracy and speed ) using various types of guns , such as firearms and airguns . Shooting sports are categorized by the type of firearm , target , and distance at which the targets are shot . ___MASK8___ is the practice of killing or trapping animals , or pursuing or tracking them with the intent of doing so . ___MASK8___ wildlife or feral animals is most commonly done by humans for food , recreation , to remove predators that are dangerous to humans or domestic animals , or for trade . Lawful ___MASK8___ is distinguished from poaching , which is the illegal killing , trapping or capture of the hunted species . The species that are hunted are referred to as game or prey and are usually mammals and birds . Otto Martin Olsen ( 13 December 1884 -- 12 July 1953 ) was a Norwegian rifle shooter who competed in the early 20th century . He won eight Olympic medals including four gold medals . He became the third shooter to win two Olympic individual gold medals and is one of five athletes to have done so at one Olympics .