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Rifles, Reloading, Optics, Equipment
Reloading
Primers and Pressure?
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<blockquote data-quote="J E Custom" data-source="post: 276481" data-attributes="member: 2736"><p>NEVER change primers without starting low or refering to reloading data for a starting point.</p><p></p><p>All primers have a different flame front(amount of heat ) designed for different powders and </p><p>volumes of powders, different case designs and calibres ( Bore Dia. ).</p><p></p><p>Even when you change brands of the same size primers you can run into trouble if loads are </p><p>max.</p><p></p><p>What you are looking for in a primer is enough to ignite a given powder charge consistently</p><p>with out over doing it and causing presure to spike to fast .</p><p></p><p>Even if the projectile is lighter it is the combination of powder,primer,bore dia.,barrel length</p><p>and bullet type that effect pressure.</p><p></p><p>The sabot rounds normaly seal in the barrel faster and better than a regular projectile so</p><p>pressure can be higher than a projectile of the same weight without the sabot.</p><p></p><p>Some reloaders have found that going from a mag primer to a standard primer improves</p><p>performance on some cartriges.</p><p></p><p>Also different primers have different cup thicknesses and can be pierced in weapons designed</p><p>for higher presures and firing pin strikes. (Not Good ).</p><p></p><p>There are primer burn rate/heat charts that you should look at and see the difference from </p><p>one primer to another and help you deside which to use.</p><p></p><p>I hope this helped</p><p></p><p>Be Carefull</p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 276481, member: 2736"] NEVER change primers without starting low or refering to reloading data for a starting point. All primers have a different flame front(amount of heat ) designed for different powders and volumes of powders, different case designs and calibres ( Bore Dia. ). Even when you change brands of the same size primers you can run into trouble if loads are max. What you are looking for in a primer is enough to ignite a given powder charge consistently with out over doing it and causing presure to spike to fast . Even if the projectile is lighter it is the combination of powder,primer,bore dia.,barrel length and bullet type that effect pressure. The sabot rounds normaly seal in the barrel faster and better than a regular projectile so pressure can be higher than a projectile of the same weight without the sabot. Some reloaders have found that going from a mag primer to a standard primer improves performance on some cartriges. Also different primers have different cup thicknesses and can be pierced in weapons designed for higher presures and firing pin strikes. (Not Good ). There are primer burn rate/heat charts that you should look at and see the difference from one primer to another and help you deside which to use. I hope this helped Be Carefull J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Primers and Pressure?
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