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Hunting
Long Range Hunting & Shooting
Cold gun issues
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<blockquote data-quote="HOT TUNA" data-source="post: 1508781" data-attributes="member: 95931"><p>Have you mapped your muzzle velocity variation due to temperature with the loads you shoot? Colder powder means lower muzzle velocity which means lower impacts if not accounted for. Vertical stringing can be caused by your ammo being heated up in a hot chamber prior to being fired because the ammo gets heated up; in turn causing higher and higher muzzle velocity with each shot. </p><p></p><p>When the gun is cold and the ammo is the same temperature as the gun. Try this. Fire your first shot. Then keep the bolt of the rifle open until you are on target and ready to make the next shot. Then chamber your next round and fire it as fast as you can while still executing proper shooting fundamentals, and see if your second shot groups with the first one. Then fire the rest of your group in this manner (not chambering your round until your ready to fire). This will keep your muzzle velocities consistent by not allowing your powder to heat up. If this fixes the problem then you need to map your muzzle velocities at various temperatures and use them for your DOPE.</p></blockquote><p></p>
[QUOTE="HOT TUNA, post: 1508781, member: 95931"] Have you mapped your muzzle velocity variation due to temperature with the loads you shoot? Colder powder means lower muzzle velocity which means lower impacts if not accounted for. Vertical stringing can be caused by your ammo being heated up in a hot chamber prior to being fired because the ammo gets heated up; in turn causing higher and higher muzzle velocity with each shot. When the gun is cold and the ammo is the same temperature as the gun. Try this. Fire your first shot. Then keep the bolt of the rifle open until you are on target and ready to make the next shot. Then chamber your next round and fire it as fast as you can while still executing proper shooting fundamentals, and see if your second shot groups with the first one. Then fire the rest of your group in this manner (not chambering your round until your ready to fire). This will keep your muzzle velocities consistent by not allowing your powder to heat up. If this fixes the problem then you need to map your muzzle velocities at various temperatures and use them for your DOPE. [/QUOTE]
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