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Rifles, Reloading, Optics, Equipment
Reloading
Primers and Pressure?
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<blockquote data-quote="edge" data-source="post: 276453" data-attributes="member: 5030"><p>My question is how much does the pressure change using different primers?</p><p></p><p>How much pressure difference would you expect with a load designed for a Small rifle primer and switched to a large magnum primer? Would it be significant?</p><p></p><p>As an example: if I check the Hodgdon Reloading Data Center website I find this load for a .458 Win Mag:</p><p></p><p>300 GR. BAR XFB Hodgdon H322 83.0C 2753 46,700 CUP </p><p>( CUP to PSI not exact, but it should be around 55,000 psi )</p><p></p><p>I have a strange setup.</p><p>I use smokeless powder in a custom muzzleloader.</p><p>For priming I use a modified 45 acp case with a <strong><u>209 cci magnum primer</u></strong>.</p><p>The flame path from the primer to the powder is 1.1875 inches.</p><p></p><p>I am shooting a Sabot/Bullet combination that weighs 285 grains and obviously it is already bore size since I loaded it from the muzzle.</p><p></p><p>My rationale is that this load should be safe since my projectile is 15 grains lighter and it can be loaded by hand ( with some effort ).</p><p>This is a compressed load in the Win Mag and probably 100% + in my ML.</p><p></p><p>The main difference is the primer!</p><p></p><p>I have a Pressure Trace attached to this rifle and this load ( one shot ) came close to 70,000 psi.</p><p>At this point I either need to question the PT reading, or probably need to conclude that the difference is primer related.</p><p></p><p>Any thought?</p><p></p><p>Thanks in advance <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>edge.</p></blockquote><p></p>
[QUOTE="edge, post: 276453, member: 5030"] My question is how much does the pressure change using different primers? How much pressure difference would you expect with a load designed for a Small rifle primer and switched to a large magnum primer? Would it be significant? As an example: if I check the Hodgdon Reloading Data Center website I find this load for a .458 Win Mag: 300 GR. BAR XFB Hodgdon H322 83.0C 2753 46,700 CUP ( CUP to PSI not exact, but it should be around 55,000 psi ) I have a strange setup. I use smokeless powder in a custom muzzleloader. For priming I use a modified 45 acp case with a [b][u]209 cci magnum primer[/u][/b][u][/u]. The flame path from the primer to the powder is 1.1875 inches. I am shooting a Sabot/Bullet combination that weighs 285 grains and obviously it is already bore size since I loaded it from the muzzle. My rationale is that this load should be safe since my projectile is 15 grains lighter and it can be loaded by hand ( with some effort ). This is a compressed load in the Win Mag and probably 100% + in my ML. The main difference is the primer! I have a Pressure Trace attached to this rifle and this load ( one shot ) came close to 70,000 psi. At this point I either need to question the PT reading, or probably need to conclude that the difference is primer related. Any thought? Thanks in advance :) edge. [/QUOTE]
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Primers and Pressure?
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