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Rifles, Reloading, Optics, Equipment
Reloading
Is This Excessive Pressure??
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<blockquote data-quote="PBR driver" data-source="post: 1496486" data-attributes="member: 20780"><p>The one sure way to know if you are having high pressure in your chamber with your components is measuring the case expansion compared to a factory load.</p><p>Factory ammo with a few exceptions are loaded to max pressures so going past those pressures is not prudent.</p><p>Measure your factory cases at the expansion ring (diameter) with a 0.0001" micrometer.</p><p>Once you have the same expansion as the factory ammo you have reached the maximum in your chamber with your components...period.</p><p>Looking at primers may give you a false reading unless it is a known primer in your rifle.</p><p>Some primers are softer than others so a soft primer will flatten out and flow sooner than a hard cupped primer.</p><p>One of Exceptions to this rule is 30-06 where the factories reduce the pressures that are in weaker actions such as the 1895 Winchester Lever Action or other weaker actions were you may go approx 0.00015 past factory loads.</p><p>Always remember every chamber/bore of the same calibers are different, your components are different Lot Numbers are different so pressures will most likely vary from loading manuals.</p><p>Get a good 0.0001" and learn to use it properly and it will keep you safer than looking at primers.</p></blockquote><p></p>
[QUOTE="PBR driver, post: 1496486, member: 20780"] The one sure way to know if you are having high pressure in your chamber with your components is measuring the case expansion compared to a factory load. Factory ammo with a few exceptions are loaded to max pressures so going past those pressures is not prudent. Measure your factory cases at the expansion ring (diameter) with a 0.0001" micrometer. Once you have the same expansion as the factory ammo you have reached the maximum in your chamber with your components...period. Looking at primers may give you a false reading unless it is a known primer in your rifle. Some primers are softer than others so a soft primer will flatten out and flow sooner than a hard cupped primer. One of Exceptions to this rule is 30-06 where the factories reduce the pressures that are in weaker actions such as the 1895 Winchester Lever Action or other weaker actions were you may go approx 0.00015 past factory loads. Always remember every chamber/bore of the same calibers are different, your components are different Lot Numbers are different so pressures will most likely vary from loading manuals. Get a good 0.0001" and learn to use it properly and it will keep you safer than looking at primers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Is This Excessive Pressure??
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