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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="Bart B" data-source="post: 1159041" data-attributes="member: 5302"><p>With everything perfect and uniform, a .308 case length changing .010" means a 4% to 7% change on its grip on a given bullet gripped by a .15" to .20" long section of the neck. How much does that change things?</p><p></p><p>A 4% to 7% change in how much force is needed to push a bullet out of a case is insignificant, in my opinion. There's normally a 20% spread in that force which will average between 10 and 60 or more pounds. Therefore, it'll be masked for the most part. Measure your own loads to see how many pounds of force it takes to pull seated bullets out.</p><p></p><p>If you want to see what the muzzle velocity difference is, then mount your barreled action in a fixed place so it doesn't move back in recoil. That'll produce the most uniform results. If you hand hold the rifle against your shoulder, the velocity spread for that load will be 3 to 5 times as great and several fps slower.</p><p></p><p>A .010" spread in case length is meaningless unless you and yours shoots no worse than .15 MOA so you can see the difference. But you may have to wear out a barrel proving it.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1159041, member: 5302"] With everything perfect and uniform, a .308 case length changing .010" means a 4% to 7% change on its grip on a given bullet gripped by a .15" to .20" long section of the neck. How much does that change things? A 4% to 7% change in how much force is needed to push a bullet out of a case is insignificant, in my opinion. There's normally a 20% spread in that force which will average between 10 and 60 or more pounds. Therefore, it'll be masked for the most part. Measure your own loads to see how many pounds of force it takes to pull seated bullets out. If you want to see what the muzzle velocity difference is, then mount your barreled action in a fixed place so it doesn't move back in recoil. That'll produce the most uniform results. If you hand hold the rifle against your shoulder, the velocity spread for that load will be 3 to 5 times as great and several fps slower. A .010" spread in case length is meaningless unless you and yours shoots no worse than .15 MOA so you can see the difference. But you may have to wear out a barrel proving it. [/QUOTE]
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