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Rifles, Reloading, Optics, Equipment
Reloading
Pressure Signs Help Needed
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<blockquote data-quote="tim_w" data-source="post: 1835263" data-attributes="member: 11132"><p>Looks like someone needs to bushing the firing pin hole.</p><p></p><p>IMHO reading primers is one of the least accurate and wildly variable ways to read pressure signs of the case. It can tell you other things but case pressure limit thresholds not so much. Same goes for ejector swipes but to a lesser degree.</p><p></p><p>I can make prinrers flatten by increasing headspace. Ejector swipes by leaving a bit of lube on the case. etc......</p><p></p><p>Measuring the groove diameter and case head along with primer pocket seating pressure is the most helpful IMO. Neck growth is another after fl sizing.</p><p></p><p>Many case manf set the shoulders a good bit under min SAAMI /CIP spec. If you have a mid to max chamber you can have stupid amounts of headspace almost approaching 0.1 in some cases. It always pays to measure headspace on new cases vs your chamber so you know if you need to fireform the cases with a jam.</p><p></p><p>First firing a mid pressure load seems to have a positive effect on case life. Sure seems to on .223 cases shooting F/tr where you push those little cases to the ragged edge. Seems to carry over.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1835263, member: 11132"] Looks like someone needs to bushing the firing pin hole. IMHO reading primers is one of the least accurate and wildly variable ways to read pressure signs of the case. It can tell you other things but case pressure limit thresholds not so much. Same goes for ejector swipes but to a lesser degree. I can make prinrers flatten by increasing headspace. Ejector swipes by leaving a bit of lube on the case. etc...... Measuring the groove diameter and case head along with primer pocket seating pressure is the most helpful IMO. Neck growth is another after fl sizing. Many case manf set the shoulders a good bit under min SAAMI /CIP spec. If you have a mid to max chamber you can have stupid amounts of headspace almost approaching 0.1 in some cases. It always pays to measure headspace on new cases vs your chamber so you know if you need to fireform the cases with a jam. First firing a mid pressure load seems to have a positive effect on case life. Sure seems to on .223 cases shooting F/tr where you push those little cases to the ragged edge. Seems to carry over. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Pressure Signs Help Needed
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