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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Tuners- Muzzle Breaks- Barrel Harmonics Management
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<blockquote data-quote="Veteran" data-source="post: 2228689" data-attributes="member: 118038"><p>Yep, Great story from the 1970's. Ain't nothin New Under the Sun.....I think King Solomon mighta said that in Ecclesiates but he wrote a whole book on it! Rifles been vibrating and sounding off since the first blunder busses and muskets. Nowadays we can use technologies developed for aircraft or military applications or space exploration, physics, and computer analysis and models to really figure out the minutia of what really goes on after the trigger pull. </p><p></p><p>The fact that your instrumentation and transducers indicated that there was a lot of harmonic vibration at the chamber is no surprise.</p><p>What is really revealing and may mean a lot more about POI for accuracy and where the bullet hits was that big spike in vibrational harmonic song the barrel was singing in the last 2 inches just before bullet exit. That barrel was whipping around like spaghetti just as the bullet left, and that is why barrel tuners work. No amount of bullet seating, and powder selection can keep that barrel from flexing all around at the end just before the bullet leaves. It can help on timing and consistency of when the bullet leaves and getting it to leave at about the same point in that whipping/flexing cycle, but the tuner will help take out another 30% of that deviation IMHO.</p><p></p><p>So, that's why you can go from 1.5 inch MOA to .75 MOA even with a crude handmade expedient tuner. </p><p></p><p>Short fat barrels won't be as affected or as much improved by a tuner, and really finely made custom rifles that already shoot .5 and better size groups may not be improved as much, but they can still be improved from .5 to .3 MOA with some tuning.</p><p>There are always residual harmonics left over to work on, but like anything, there is the law of diminishing returns when you </p><p>get way out on the improvement curve. The increments of improvement you can achieve get less and less.</p></blockquote><p></p>
[QUOTE="Veteran, post: 2228689, member: 118038"] Yep, Great story from the 1970's. Ain't nothin New Under the Sun.....I think King Solomon mighta said that in Ecclesiates but he wrote a whole book on it! Rifles been vibrating and sounding off since the first blunder busses and muskets. Nowadays we can use technologies developed for aircraft or military applications or space exploration, physics, and computer analysis and models to really figure out the minutia of what really goes on after the trigger pull. The fact that your instrumentation and transducers indicated that there was a lot of harmonic vibration at the chamber is no surprise. What is really revealing and may mean a lot more about POI for accuracy and where the bullet hits was that big spike in vibrational harmonic song the barrel was singing in the last 2 inches just before bullet exit. That barrel was whipping around like spaghetti just as the bullet left, and that is why barrel tuners work. No amount of bullet seating, and powder selection can keep that barrel from flexing all around at the end just before the bullet leaves. It can help on timing and consistency of when the bullet leaves and getting it to leave at about the same point in that whipping/flexing cycle, but the tuner will help take out another 30% of that deviation IMHO. So, that's why you can go from 1.5 inch MOA to .75 MOA even with a crude handmade expedient tuner. Short fat barrels won't be as affected or as much improved by a tuner, and really finely made custom rifles that already shoot .5 and better size groups may not be improved as much, but they can still be improved from .5 to .3 MOA with some tuning. There are always residual harmonics left over to work on, but like anything, there is the law of diminishing returns when you get way out on the improvement curve. The increments of improvement you can achieve get less and less. [/QUOTE]
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