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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
vertical spread
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<blockquote data-quote="Bart B" data-source="post: 1153551" data-attributes="member: 5302"><p>Never ever heard of that guys explanation as to why shots climb vertically that consistently; very weird. Nor can I figure out why adding more powder would make shots stop changing exactly 1/4" vertically for every shot fired. I wonder what his reasons are for stringing that same way down, left and right.</p><p></p><p>But I demonstrated that happening shooting a shouldered rifle as it rested atop bags on a benchtop. I leaned forward and down a little bit harder for the second and more for the third shot. As the barrel had a contact point at the fore end tip up against the barrel, the more I leaned forward and down on the rifle, the more the fore end pressed up against the barrel. The barrel just bounced vertically more for each shot. Barrels bounce off of hard things so that convinced the rifle's owner to free float the barrel. After that barrel was free floated, it would shoot several shots to point of aim inside 1/2 inch at 100 yards.</p><p></p><p>One other possible cause; the barrel and receiver heat up a little with each shot. That heat expands the metal. If the barrel shoulder bears against the receiver face at one point more than even all the way around, that point bears hardest on the barrel. So, the barrel ends up with a stress point there that bends/bounces the barrel up a bit more in a direction opposite the hard bearing point for each shot. Fix it by having the receiver face squared off a few thousandths then a shim put in to headspace the barrel correctly when clocked in. Good barrels so fit in well built rifles will shoot several dozen shots into 1/3 inch at 100 yards; and with a grain or more spread across different charge weights for a given bullet.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1153551, member: 5302"] Never ever heard of that guys explanation as to why shots climb vertically that consistently; very weird. Nor can I figure out why adding more powder would make shots stop changing exactly 1/4" vertically for every shot fired. I wonder what his reasons are for stringing that same way down, left and right. But I demonstrated that happening shooting a shouldered rifle as it rested atop bags on a benchtop. I leaned forward and down a little bit harder for the second and more for the third shot. As the barrel had a contact point at the fore end tip up against the barrel, the more I leaned forward and down on the rifle, the more the fore end pressed up against the barrel. The barrel just bounced vertically more for each shot. Barrels bounce off of hard things so that convinced the rifle's owner to free float the barrel. After that barrel was free floated, it would shoot several shots to point of aim inside 1/2 inch at 100 yards. One other possible cause; the barrel and receiver heat up a little with each shot. That heat expands the metal. If the barrel shoulder bears against the receiver face at one point more than even all the way around, that point bears hardest on the barrel. So, the barrel ends up with a stress point there that bends/bounces the barrel up a bit more in a direction opposite the hard bearing point for each shot. Fix it by having the receiver face squared off a few thousandths then a shim put in to headspace the barrel correctly when clocked in. Good barrels so fit in well built rifles will shoot several dozen shots into 1/3 inch at 100 yards; and with a grain or more spread across different charge weights for a given bullet. [/QUOTE]
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