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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Mitigating Barrel Whip and Harmonics
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<blockquote data-quote="25WSM" data-source="post: 1766035" data-attributes="member: 38048"><p>Tune window all comes down to one basic component. Dwell time at the top and bottom of the barrel swing. I do use the word basic because yes there are a ton of other things that barrels do while being shot. You just can't say heavy barrels have bigger tune windows. I can assure you that a heavy short barrel does not have a wide tune window. Ask any short range br shooter how wide of a tune does a ppc barrel have. It's tune window is so narrow you need to tune it every 10 degrees of temp change or it won't shoot competitive. Now take my 300wsm heavy gun. It has a 34 inch 1.45 diameter barrel and you can drive a truck through that tune window. Same thing happens when you put a muzzle brake or tuner on. It slows down the muzzle speed so the barrel stays at the peak or the bottom longer. Bullets exiting anyplace that is not near the top or bottom are not in tune. Everything near the middle of the swing is bad because the barrel is swinging faster and over a greater distance. So again basically the slower your muzzle swings and the farther it swings gives you a greater tune window. If you make your barrel heavier and don't increase the stiffness it will have a wider tune. You make a barrel longer it will have a wider tune. A straight taper 1.250 barrel has a wider tune window than a hvy varmint of the same length. It's because the gain in weight is greater than the stiffness it gains and therefore swings longer and slower. Varmint Al has some of the most comprehensive test of this or you can talk to Mike Azzel for hours on end. Yes it's physics but you need to know what part of the physics is causing this. And yes you can not explain all that goes on with that barrel harmonics here but with the basics it's easy to understand and that is all that most people will need to know.</p><p>Shep</p></blockquote><p></p>
[QUOTE="25WSM, post: 1766035, member: 38048"] Tune window all comes down to one basic component. Dwell time at the top and bottom of the barrel swing. I do use the word basic because yes there are a ton of other things that barrels do while being shot. You just can't say heavy barrels have bigger tune windows. I can assure you that a heavy short barrel does not have a wide tune window. Ask any short range br shooter how wide of a tune does a ppc barrel have. It's tune window is so narrow you need to tune it every 10 degrees of temp change or it won't shoot competitive. Now take my 300wsm heavy gun. It has a 34 inch 1.45 diameter barrel and you can drive a truck through that tune window. Same thing happens when you put a muzzle brake or tuner on. It slows down the muzzle speed so the barrel stays at the peak or the bottom longer. Bullets exiting anyplace that is not near the top or bottom are not in tune. Everything near the middle of the swing is bad because the barrel is swinging faster and over a greater distance. So again basically the slower your muzzle swings and the farther it swings gives you a greater tune window. If you make your barrel heavier and don't increase the stiffness it will have a wider tune. You make a barrel longer it will have a wider tune. A straight taper 1.250 barrel has a wider tune window than a hvy varmint of the same length. It's because the gain in weight is greater than the stiffness it gains and therefore swings longer and slower. Varmint Al has some of the most comprehensive test of this or you can talk to Mike Azzel for hours on end. Yes it's physics but you need to know what part of the physics is causing this. And yes you can not explain all that goes on with that barrel harmonics here but with the basics it's easy to understand and that is all that most people will need to know. Shep [/QUOTE]
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