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The Range
Ammo & Reloading
magnum large pistol primer in 45 acp
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<blockquote data-quote="Rod Snell" data-source="post: 733171" data-attributes="member: 796"><p>Pressure signs in straight-walled pistol cartridges are notoriously unreliable.</p><p>In "working up" such cartridges, the first sure sign may be a blown case.</p><p>Changing primers can cause 5,000 PSI <strong>PEAK</strong> pressure increases, sometimes with little velocity increase. The amount of pressure increase varies wildly with different powders.</p><p></p><p>If I had to use Mag primers, I'd use the <strong>starting</strong> load for a medium powder from a reliable manual and see if it cycled the gun reliably, just for a plinking load.</p></blockquote><p></p>
[QUOTE="Rod Snell, post: 733171, member: 796"] Pressure signs in straight-walled pistol cartridges are notoriously unreliable. In "working up" such cartridges, the first sure sign may be a blown case. Changing primers can cause 5,000 PSI [B]PEAK[/B] pressure increases, sometimes with little velocity increase. The amount of pressure increase varies wildly with different powders. If I had to use Mag primers, I'd use the [B]starting[/B] load for a medium powder from a reliable manual and see if it cycled the gun reliably, just for a plinking load. [/QUOTE]
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