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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
What learned over time building AR's
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<blockquote data-quote="FlyFishn1" data-source="post: 3088813" data-attributes="member: 127209"><p>Very interesting. Thank you.</p><p></p><p>I have heard, also, that 1:7, as you allude to in a different way, can "over-spin" bullets. One example is some soft point bullets actually disintegrating in the barrel from the centrifugal force encountered at the higher RPM. The evidence of it is lack of a hole in the target, rather a spray of fragments.</p><p></p><p>I am curious, also, as cohunt questions: </p><p></p><p></p><p>Thinking about the conundrum further, with the barrel length you mention going from a 16" to a 20" increasing the velocity at the muzzle, perhaps it isn't necessarily a function of the velocity or RPM, but rather the pressure behind the bullet that is accelerating it through the barrel that gets to a certain point where it throws off the stability when it exits the muzzle? </p><p></p><p>I am not sure if this analogy will properly illustrate but one way to think about it may be the affect of backing up a bumper-pull trailer where you have to keep the hitch under the center line of where you are trying to go - and that takes a lot of work side to side to get the hitch back under the center as "pushing" it is inherently unstable. The faster you try to back the rig up, and the shorter the trailer axle distance from the hitch, the more twitchy the response - eventually to the point you can't control it.</p><p></p><p>I don't know, but this intrigues me. I wouldn't say the above dynamics (going to factoring in the velocity to get the stability back in the round) is a function of the quality of the gun, it is the physics at play. The question in my mind is how do you identify those physics and tune to them to get the results you're after? I believe that can be done, within reason, with any firearm/round.</p></blockquote><p></p>
[QUOTE="FlyFishn1, post: 3088813, member: 127209"] Very interesting. Thank you. I have heard, also, that 1:7, as you allude to in a different way, can "over-spin" bullets. One example is some soft point bullets actually disintegrating in the barrel from the centrifugal force encountered at the higher RPM. The evidence of it is lack of a hole in the target, rather a spray of fragments. I am curious, also, as cohunt questions: Thinking about the conundrum further, with the barrel length you mention going from a 16" to a 20" increasing the velocity at the muzzle, perhaps it isn't necessarily a function of the velocity or RPM, but rather the pressure behind the bullet that is accelerating it through the barrel that gets to a certain point where it throws off the stability when it exits the muzzle? I am not sure if this analogy will properly illustrate but one way to think about it may be the affect of backing up a bumper-pull trailer where you have to keep the hitch under the center line of where you are trying to go - and that takes a lot of work side to side to get the hitch back under the center as "pushing" it is inherently unstable. The faster you try to back the rig up, and the shorter the trailer axle distance from the hitch, the more twitchy the response - eventually to the point you can't control it. I don't know, but this intrigues me. I wouldn't say the above dynamics (going to factoring in the velocity to get the stability back in the round) is a function of the quality of the gun, it is the physics at play. The question in my mind is how do you identify those physics and tune to them to get the results you're after? I believe that can be done, within reason, with any firearm/round. [/QUOTE]
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AR15/10 Rifles
What learned over time building AR's
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