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Gain additional velocity by shooting prone ...
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<blockquote data-quote="GeorgeS" data-source="post: 1521413" data-attributes="member: 107925"><p>My comments on the YouTube page: <start> Don't understand the confusion below about a simple matter of momentum. Recoil begins at the moment the trigger is pulled. The hammer moving forward causes the rifle to move backwards, imperceptibly. The moment of the explosion, as the pressure builds in the cartridge, the powder in front of it starts moving forward, pushing the rifle backwards. Every action produces a reaction - it's fundamental physics. </p><p></p><p>If the collective resisting force is in any way different - the firmness of the grip, etc. - the motion of the rifle will be different. Recoil is underway the entire time the bullet is being accelerated down the barrel, moving the rifle backwards. It's more noticeable when the bullet leaves the barrel because of the rearward thrust imposed by the gases in the barrel being freed to accelerate to a much higher velocity than the bullet. </p><p></p><p>When you are sitting, the resistive moment of the torso is the weight of the upper body pivoting about the hips; when leaning forward, the resistive moment of the torso is that weight plus the force required to lift the torso to a right angle with the angle of thrust of the rifle. That's exactly the principle behind the delay imposed on blowback by a toggle action like the Luger. Each of these motions moves the butt of the rifle, changing the bore axis alignment. When prone, the resistive force is the weight of the entire body aligned axially with the bore of the rifle. (and the position of the recoil pad - against muscle tissue or against bone - ed)</p><p></p><p>These different resistive forces change the motion of the rifle both backwards and axially. Whether that motion difference can be accounted for by a chronograph, given the intrinsic shot-shot variation from cartridge to cartridge is the question. I assume that the muzzle velocities that (you) are reporting are a mean value of a string of shots, rather than a single difference, because 20 f/s is well within natural variability from slight differences in bullet weight, neck tension, seating depth, powder charge, powder position, primer activity, etc. </p><p></p><p>It would be helpful to the understanding of those commenting below if you had also included the number of shots and the standard deviation of each string. But it is easy to believe that a prone position would provide more resistance to backward motion of the rifle, resulting in a slightly higher muzzle velocity. <end comment></p><p></p><p>My suspicion is that the velocity difference is real, caused by the higher resistance to the backward motion of the gun in the prone position. I'm less convinced that the change in point of impact is the result of that velocity difference. It's more likely the result of the motion of the shoulder up (when leaning forward) or down (when sitting upright) than the velocity difference.</p></blockquote><p></p>
[QUOTE="GeorgeS, post: 1521413, member: 107925"] My comments on the YouTube page: <start> Don't understand the confusion below about a simple matter of momentum. Recoil begins at the moment the trigger is pulled. The hammer moving forward causes the rifle to move backwards, imperceptibly. The moment of the explosion, as the pressure builds in the cartridge, the powder in front of it starts moving forward, pushing the rifle backwards. Every action produces a reaction - it's fundamental physics. If the collective resisting force is in any way different - the firmness of the grip, etc. - the motion of the rifle will be different. Recoil is underway the entire time the bullet is being accelerated down the barrel, moving the rifle backwards. It's more noticeable when the bullet leaves the barrel because of the rearward thrust imposed by the gases in the barrel being freed to accelerate to a much higher velocity than the bullet. When you are sitting, the resistive moment of the torso is the weight of the upper body pivoting about the hips; when leaning forward, the resistive moment of the torso is that weight plus the force required to lift the torso to a right angle with the angle of thrust of the rifle. That's exactly the principle behind the delay imposed on blowback by a toggle action like the Luger. Each of these motions moves the butt of the rifle, changing the bore axis alignment. When prone, the resistive force is the weight of the entire body aligned axially with the bore of the rifle. (and the position of the recoil pad - against muscle tissue or against bone - ed) These different resistive forces change the motion of the rifle both backwards and axially. Whether that motion difference can be accounted for by a chronograph, given the intrinsic shot-shot variation from cartridge to cartridge is the question. I assume that the muzzle velocities that (you) are reporting are a mean value of a string of shots, rather than a single difference, because 20 f/s is well within natural variability from slight differences in bullet weight, neck tension, seating depth, powder charge, powder position, primer activity, etc. It would be helpful to the understanding of those commenting below if you had also included the number of shots and the standard deviation of each string. But it is easy to believe that a prone position would provide more resistance to backward motion of the rifle, resulting in a slightly higher muzzle velocity. <end comment> My suspicion is that the velocity difference is real, caused by the higher resistance to the backward motion of the gun in the prone position. I'm less convinced that the change in point of impact is the result of that velocity difference. It's more likely the result of the motion of the shoulder up (when leaning forward) or down (when sitting upright) than the velocity difference. [/QUOTE]
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