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Long Range Hunting & Shooting
recoil v accuracy
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<blockquote data-quote="lightwind" data-source="post: 521831" data-attributes="member: 30140"><p>OK, I have to join in on this discussion. First, the gun does not have to move backward to affect the bullet motion. I won't go into that in this post because I have not gone through my version of the math (and might not get to it today). However, I have looked at what the barrel does. Remember that the barrel rings like a bell and has multiple modes of vibration. The issue (and the reason some loads are better than others) is that you try to get the bullet out at a consistent location of the vibration of the barrel. As an example, when the bullet fires and connects with the lands it sends a shock wave through the barrel (not recoil but a shock wave). The shock wave moves at the speed of sound in steel through the barrel (about 3000 meter/sec or about 19,685 ft/sec). If we use the time in the barrel (about 2ms) from <a href="http://www.longrangehunting.com/forums/members/rdm416/" target="_blank">RDM416</a> we get about 10 cycles up and down the barrel for the shock wave before the bullet clears the barrel (just a quick estimate). What that means is that the barrel starts vibrating very quickly after detonation. This is one of the reasons that a heavy barrel is better than a light barrel and barrel stiffness is important. I am in agreement that the gun does not move much (although I have not done the calculations it is just common sense) but the barrel starts reacting from the moment of the primer detonation. Tuning the vibration of the barrel to the load is one of the more important parts of precision (not accuracy). In the case of the shooter here - I assume that he has tried multiple loads to be sure that it is not the load affecting his precision. However, tuning a heavy load becomes more important as the barrel stiffness goes down.</p></blockquote><p></p>
[QUOTE="lightwind, post: 521831, member: 30140"] OK, I have to join in on this discussion. First, the gun does not have to move backward to affect the bullet motion. I won't go into that in this post because I have not gone through my version of the math (and might not get to it today). However, I have looked at what the barrel does. Remember that the barrel rings like a bell and has multiple modes of vibration. The issue (and the reason some loads are better than others) is that you try to get the bullet out at a consistent location of the vibration of the barrel. As an example, when the bullet fires and connects with the lands it sends a shock wave through the barrel (not recoil but a shock wave). The shock wave moves at the speed of sound in steel through the barrel (about 3000 meter/sec or about 19,685 ft/sec). If we use the time in the barrel (about 2ms) from [URL="http://www.longrangehunting.com/forums/members/rdm416/"]RDM416[/URL] we get about 10 cycles up and down the barrel for the shock wave before the bullet clears the barrel (just a quick estimate). What that means is that the barrel starts vibrating very quickly after detonation. This is one of the reasons that a heavy barrel is better than a light barrel and barrel stiffness is important. I am in agreement that the gun does not move much (although I have not done the calculations it is just common sense) but the barrel starts reacting from the moment of the primer detonation. Tuning the vibration of the barrel to the load is one of the more important parts of precision (not accuracy). In the case of the shooter here - I assume that he has tried multiple loads to be sure that it is not the load affecting his precision. However, tuning a heavy load becomes more important as the barrel stiffness goes down. [/QUOTE]
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