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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Tuner and Accurizer
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<blockquote data-quote="Bart B" data-source="post: 97779" data-attributes="member: 5302"><p>I didn't know someone had a way to calculate barrel time. To me, it would be interesting as to how all the variables are managed. Here's some of the variables that determine how long it takes the bullet to go from case mouth to out the muzzle:</p><p></p><p>Bore and groove diameter.</p><p>Rifling land width.</p><p>Flash hole diameter.</p><p>Powder temperature.</p><p>Powder burning characteristics.</p><p>Primer intensity (varies with firing pin impact).</p><p>Bullet jacket to bore resistance.</p><p>Leade angle.</p><p></p><p>And there's probably a few others, too. And of coures measuring barrel time would be the only proof the calculations were accurate.</p><p></p><p>Regarding tuners on centerfire barrels; it can be done. Just get a split ring (shaft collar) of the right diameter and weight, then put it on the barrel and tighten the screws on each side of the two halves. You can move it a bit front to back to find out what happens.</p><p></p><p>Rebarding the shock wave theory mentioned; I checked it out and it ain't quite reality. Rifle barrels have only one whip when fired; a US Olympic Team's mechanical engineer proved this years ago using accelerometers placed very close to the barrel to measure its movement when fired. And most rifle barrel's resonant (fudamental)frequency is well under 100 Hz and usally around 40 to 60 Hz; not in the hundreds the article mentioned. The high pitched "ping" a barrel makes when tapped produces vibrations so small they have no effect on accuracy. It's the single whip from recoil that makes the muzzle point up or down to different places when the bullet leaves to be significant. But the difference it makes in centerfire rifles is small 'cause as long as the bullet leaves at the same point in that whip for each shot, best accuracy is attained. With smallbore bullets taking three times as long to exit the barrel as centerfire bullets, timing that single barrel whip to get best accuracy is easily done with a moveable barrel weight.</p></blockquote><p></p>
[QUOTE="Bart B, post: 97779, member: 5302"] I didn't know someone had a way to calculate barrel time. To me, it would be interesting as to how all the variables are managed. Here's some of the variables that determine how long it takes the bullet to go from case mouth to out the muzzle: Bore and groove diameter. Rifling land width. Flash hole diameter. Powder temperature. Powder burning characteristics. Primer intensity (varies with firing pin impact). Bullet jacket to bore resistance. Leade angle. And there's probably a few others, too. And of coures measuring barrel time would be the only proof the calculations were accurate. Regarding tuners on centerfire barrels; it can be done. Just get a split ring (shaft collar) of the right diameter and weight, then put it on the barrel and tighten the screws on each side of the two halves. You can move it a bit front to back to find out what happens. Rebarding the shock wave theory mentioned; I checked it out and it ain't quite reality. Rifle barrels have only one whip when fired; a US Olympic Team's mechanical engineer proved this years ago using accelerometers placed very close to the barrel to measure its movement when fired. And most rifle barrel's resonant (fudamental)frequency is well under 100 Hz and usally around 40 to 60 Hz; not in the hundreds the article mentioned. The high pitched "ping" a barrel makes when tapped produces vibrations so small they have no effect on accuracy. It's the single whip from recoil that makes the muzzle point up or down to different places when the bullet leaves to be significant. But the difference it makes in centerfire rifles is small 'cause as long as the bullet leaves at the same point in that whip for each shot, best accuracy is attained. With smallbore bullets taking three times as long to exit the barrel as centerfire bullets, timing that single barrel whip to get best accuracy is easily done with a moveable barrel weight. [/QUOTE]
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