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recoil v accuracy
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<blockquote data-quote="lightwind" data-source="post: 523534" data-attributes="member: 30140"><p>WildRose:</p><p></p><p>Good job of crunching numbers. You said: "With an average recoil speed of 14fps the maximum possible movement of the rifle due to inertial forces alone is .0162 feet prior to the bullet exiting the barrel." That would be about .19" using averages instead of integrals and for a fast bullet. If you recall the article by Darrell Holland on Dwell time:</p><p></p><p><a href="http://www.longrangehunting.com/articles/trigger-dwell-time-1.php" target="_blank">Dwell Time And Your Trigger</a></p><p></p><p>He stated that: " This critical time is around .025 thousands of a second and the rifle will recoil rearward approximately .250 -.375 inches before the bullet exits the barrel. Variables being the weight of the rifle, muzzle velocity and bullet weight." And he used the more complex approach of integration and actual measurement. However, your number is close to his and that is very good approximation. The point is that if the whole rifle has moved about 0.2" that is significant. It is also why hold and follow through are so important so that the rifle is moving directly back during this initial excursion. If it twists or yaws the barrel will be pointing the projectile in the wrong direction.</p><p></p><p>As you said: "That is NOT enough to affect accuracy to any significant degree if you are holding on to the rifle at all."</p><p></p><p>However, I would substitute "correctly" for "at all." The reason I say that is that you have learned to hold the rifle "correctly." Your training is such that if you are holding the rifle "at all" you are holding it correctly. That is not the same for all of us who are shooting. That is the reason that I am sure you will shoot much better than I but that does not necessarily mean that what you do will translate directly to the physics of shooting. It is the way you were trained without all of the details of why. For you, 0.20" travel is not bad. For some, that 0.20" will be translated into barrel motion and twist. You shoot well because of training. We don't all have that training built in to our DNA so we have to learn to shoot like you do and some of us have to do that by recognizing why.</p></blockquote><p></p>
[QUOTE="lightwind, post: 523534, member: 30140"] WildRose: Good job of crunching numbers. You said: "With an average recoil speed of 14fps the maximum possible movement of the rifle due to inertial forces alone is .0162 feet prior to the bullet exiting the barrel." That would be about .19" using averages instead of integrals and for a fast bullet. If you recall the article by Darrell Holland on Dwell time: [url=http://www.longrangehunting.com/articles/trigger-dwell-time-1.php]Dwell Time And Your Trigger[/url] He stated that: " This critical time is around .025 thousands of a second and the rifle will recoil rearward approximately .250 -.375 inches before the bullet exits the barrel. Variables being the weight of the rifle, muzzle velocity and bullet weight." And he used the more complex approach of integration and actual measurement. However, your number is close to his and that is very good approximation. The point is that if the whole rifle has moved about 0.2" that is significant. It is also why hold and follow through are so important so that the rifle is moving directly back during this initial excursion. If it twists or yaws the barrel will be pointing the projectile in the wrong direction. As you said: "That is NOT enough to affect accuracy to any significant degree if you are holding on to the rifle at all." However, I would substitute "correctly" for "at all." The reason I say that is that you have learned to hold the rifle "correctly." Your training is such that if you are holding the rifle "at all" you are holding it correctly. That is not the same for all of us who are shooting. That is the reason that I am sure you will shoot much better than I but that does not necessarily mean that what you do will translate directly to the physics of shooting. It is the way you were trained without all of the details of why. For you, 0.20" travel is not bad. For some, that 0.20" will be translated into barrel motion and twist. You shoot well because of training. We don't all have that training built in to our DNA so we have to learn to shoot like you do and some of us have to do that by recognizing why. [/QUOTE]
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