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Rifles, Reloading, Optics, Equipment
Reloading
Problem with deviation on my handloads
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<blockquote data-quote="Bart B" data-source="post: 651600" data-attributes="member: 5302"><p>Thanks for clarification on velocity.</p><p></p><p>There's a few things that'll cause that much spread.</p><p></p><p>One is a weak firing pin spring. Primer flame's not consistant and that doesn't burn the powder as consistantly.</p><p></p><p>Then there's the issue of the firing pin not protruding enough from the bolt face to properly smack the primer. It should be at least .055" and .060" is better. Insufficient protrusion can cause the same problems as a weak spring.</p><p></p><p>Another is the way one holds their rifle resting on something atop a bench. Us humans don't hold rifles against our shoulders with exactly the same amount of force. I've seen as much as 90 fps difference in average muzzle velocity with the same .308 Win. rifle and ammo by just holding the rifle very tight to virtually no pressure at all.</p><p></p><p>Neck tension by the case mouth on the bullet isn't consistant. This often happens when the case mouth's not enlarged enough when sizing fired cases. Peak pressures will be both higher and have a wider spread; that's enough to cause large spreads in muzzle velocity.</p></blockquote><p></p>
[QUOTE="Bart B, post: 651600, member: 5302"] Thanks for clarification on velocity. There's a few things that'll cause that much spread. One is a weak firing pin spring. Primer flame's not consistant and that doesn't burn the powder as consistantly. Then there's the issue of the firing pin not protruding enough from the bolt face to properly smack the primer. It should be at least .055" and .060" is better. Insufficient protrusion can cause the same problems as a weak spring. Another is the way one holds their rifle resting on something atop a bench. Us humans don't hold rifles against our shoulders with exactly the same amount of force. I've seen as much as 90 fps difference in average muzzle velocity with the same .308 Win. rifle and ammo by just holding the rifle very tight to virtually no pressure at all. Neck tension by the case mouth on the bullet isn't consistant. This often happens when the case mouth's not enlarged enough when sizing fired cases. Peak pressures will be both higher and have a wider spread; that's enough to cause large spreads in muzzle velocity. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Problem with deviation on my handloads
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