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Rifles, Reloading, Optics, Equipment
Reloading
Primer consistancy
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<blockquote data-quote="Natty Bumpo" data-source="post: 193134" data-attributes="member: 10106"><p>In Handloader No. 236 (Aug-Sept 2005) John Barsness authored an article titled Velocity and Pressure. In it he provides a table giving average muzzle velocity and average pressure for a 7mm Rem Mag using a 160 gr Sierra Boat tail, 66.0 grains of H4831 and Winchester brass. They tried different primers for the above load. Results were:</p><p> </p><p>Winchester WLRM 3,045ft/sec 67,600PSI</p><p>Winchester WLR 3,024 64,400</p><p>Federal 215 3,036 61,400</p><p>CCI 250 3,039 61,500</p><p>Remington 9.5M 3,041 59,300</p><p>CCI 200 3,011 54,800</p><p> </p><p>There's not much change in velocity, but changing from a CCI200 primer to a WLRM resulted in a 23% jump in pressure. I'm no engineer or internal ballistics expert, but since velocity didn't change appreciably, I can only figure these must have been peak pressure values. I suppose velocity must be more strongly correlated with the total pressure curve rather than peak pressure (I'm speculating on matters I have absolutely no education or training in).</p></blockquote><p></p>
[QUOTE="Natty Bumpo, post: 193134, member: 10106"] In Handloader No. 236 (Aug-Sept 2005) John Barsness authored an article titled Velocity and Pressure. In it he provides a table giving average muzzle velocity and average pressure for a 7mm Rem Mag using a 160 gr Sierra Boat tail, 66.0 grains of H4831 and Winchester brass. They tried different primers for the above load. Results were: Winchester WLRM 3,045ft/sec 67,600PSI Winchester WLR 3,024 64,400 Federal 215 3,036 61,400 CCI 250 3,039 61,500 Remington 9.5M 3,041 59,300 CCI 200 3,011 54,800 There's not much change in velocity, but changing from a CCI200 primer to a WLRM resulted in a 23% jump in pressure. I'm no engineer or internal ballistics expert, but since velocity didn't change appreciably, I can only figure these must have been peak pressure values. I suppose velocity must be more strongly correlated with the total pressure curve rather than peak pressure (I'm speculating on matters I have absolutely no education or training in). [/QUOTE]
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Reloading
Primer consistancy
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