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Hunting
Long Range Hunting & Shooting
Bolt bounce and Scope shift when dry firing
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<blockquote data-quote="jd5521" data-source="post: 1909767" data-attributes="member: 94694"><p>Are you shooting off a bipod? I have seen the vertical happen on a bipod and bench and not being loaded that well into the rifle along with a weak rear bag such as one for grab and run in prs.</p><p></p><p>The following is from Speedy:</p><p></p><p>Remember that vertical can result from myriad gear issues and gun-handling mistakes. Try to isolate one item at a time as you work to improve your groups.</p><p></p><table style='width: 100%'><tr><td></td></tr></table><p></p><p>• Barrel Weight--A lot of rifles are muzzle-heavy. Some rifles have too heavy a barrel and this causes vertical, especially when shooting free recoil. Basically the gun wants to tip forward. The remedy is to trim or flute the barrel, or add weight in the rear (if you can stay within weight limits).</p><p></p><p>• Unbalanced Rifle--If the rifle is not balanced, it does not recoil straight, and it will jump in the bags. If the rifle is built properly this will not happen. Clay Spencer calls this "recoil balancing", and he uses dual scales (front and rear) to ensure the rifle recoils properly.</p><p></p><p>• Firing Pin--A number of firing-pin issues can cause vertical. First, a firing pin spring that is either too weak or too strong will induce vertical problems. If you think this is the problem change springs and see what happens. Second, a firing pin that is not seated correctly in the bolt (in the cocked position) will cause poor ignition. Take the bolt out of rifle and look in the firing pin hole. If you cannot see the entire end of firing pin it has come out of the hole. Lastly, a firing pin dragging in bolt or shroud can cause vertical. Listen to the sound when you dry fire. If you don't hear the same sound each shot, something is wrong.</p><p></p><p>• Trigger--A trigger sear with excessive spring load can cause problems. To diagnose, with an UNLOADED gun, hold the trigger in firing position and push down on sear with your thumb. If it is hard to push down, this will cause vertical problems.</p><p></p><p>• Stock Flex--Some stocks are very flexible. This can cause vertical. There are ways to stiffen stocks, but sometimes replacement is the best answer.</p></blockquote><p></p>
[QUOTE="jd5521, post: 1909767, member: 94694"] Are you shooting off a bipod? I have seen the vertical happen on a bipod and bench and not being loaded that well into the rifle along with a weak rear bag such as one for grab and run in prs. The following is from Speedy: Remember that vertical can result from myriad gear issues and gun-handling mistakes. Try to isolate one item at a time as you work to improve your groups. [TABLE] [TR] [TD][/TD] [/TR] [/TABLE] • Barrel Weight--A lot of rifles are muzzle-heavy. Some rifles have too heavy a barrel and this causes vertical, especially when shooting free recoil. Basically the gun wants to tip forward. The remedy is to trim or flute the barrel, or add weight in the rear (if you can stay within weight limits). • Unbalanced Rifle--If the rifle is not balanced, it does not recoil straight, and it will jump in the bags. If the rifle is built properly this will not happen. Clay Spencer calls this "recoil balancing", and he uses dual scales (front and rear) to ensure the rifle recoils properly. • Firing Pin--A number of firing-pin issues can cause vertical. First, a firing pin spring that is either too weak or too strong will induce vertical problems. If you think this is the problem change springs and see what happens. Second, a firing pin that is not seated correctly in the bolt (in the cocked position) will cause poor ignition. Take the bolt out of rifle and look in the firing pin hole. If you cannot see the entire end of firing pin it has come out of the hole. Lastly, a firing pin dragging in bolt or shroud can cause vertical. Listen to the sound when you dry fire. If you don't hear the same sound each shot, something is wrong. • Trigger--A trigger sear with excessive spring load can cause problems. To diagnose, with an UNLOADED gun, hold the trigger in firing position and push down on sear with your thumb. If it is hard to push down, this will cause vertical problems. • Stock Flex--Some stocks are very flexible. This can cause vertical. There are ways to stiffen stocks, but sometimes replacement is the best answer. [/QUOTE]
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Bolt bounce and Scope shift when dry firing
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