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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrels Tight or Loose ??
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<blockquote data-quote="Fiftydriver" data-source="post: 109779" data-attributes="member: 10"><p>[ QUOTE ]</p><p>Velocity wise, tighter barrels typically shoot bullets faster than loose ones. The best example of this was the same rifles used by the military teams. When Lake City Arsenal came out with their M852 match ammo with Sierra 168's in them, the loose 22-inch barrels on M14 (and civilian M1A) rifles usually wouldn't shoot them fast enough to stay supersonic through 1000 yards. Tight barrels with .3075-inch groove diameters did as they chronographed the same load about 100 fps faster than a loose barrel. But not enough people used barrels that tight so Lake City Arsenal started using Sierra 175's in their match ammo and that solved the problem as they left at the same speed but have a higher ballistic coefficient.</p><p> </p><p></p><p>[/ QUOTE ]</p><p></p><p>I would have to agree and disagree with you on this one. Yes, if you take the same ammo and shoot it in two different rifles, the one that has the tighter bore will produce higher velocity, for one simple reason, the pressure increases.</p><p></p><p>I do not believe the original question was pertaining to using a standard mil spec ammunition though.</p><p></p><p>If you take two barrels with different bore diameters and load them both to the same pressure level, say 60,000 psi. The larger diameter bore will produce higher velocities on average then the smaller diameter bore.</p><p></p><p>Simple reason, it takes more pressure to drive a bullet down a tighter hole then it does a larger hole.</p><p></p><p>In your comparision you are correct but I do not feel that is relative to the question at hand here.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 109779, member: 10"] [ QUOTE ] Velocity wise, tighter barrels typically shoot bullets faster than loose ones. The best example of this was the same rifles used by the military teams. When Lake City Arsenal came out with their M852 match ammo with Sierra 168's in them, the loose 22-inch barrels on M14 (and civilian M1A) rifles usually wouldn't shoot them fast enough to stay supersonic through 1000 yards. Tight barrels with .3075-inch groove diameters did as they chronographed the same load about 100 fps faster than a loose barrel. But not enough people used barrels that tight so Lake City Arsenal started using Sierra 175's in their match ammo and that solved the problem as they left at the same speed but have a higher ballistic coefficient. [/ QUOTE ] I would have to agree and disagree with you on this one. Yes, if you take the same ammo and shoot it in two different rifles, the one that has the tighter bore will produce higher velocity, for one simple reason, the pressure increases. I do not believe the original question was pertaining to using a standard mil spec ammunition though. If you take two barrels with different bore diameters and load them both to the same pressure level, say 60,000 psi. The larger diameter bore will produce higher velocities on average then the smaller diameter bore. Simple reason, it takes more pressure to drive a bullet down a tighter hole then it does a larger hole. In your comparision you are correct but I do not feel that is relative to the question at hand here. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrels Tight or Loose ??
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