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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Custom action pressure ceiling.
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<blockquote data-quote="Pdvdh" data-source="post: 375160" data-attributes="member: 4191"><p>I will offer a differing opinion and state that the weak point is always the brass casing in any modern day firearm. The case head and primer pocket will swell under repetitive firings before a bolt, barrel, or action rupture, for the observant reloader who works up a load cautiously, while observing primer pocket and case head swelling. Without the expensive pressure testing equipment, I know of no better method of monitoring pressure. The brass will yield before the steel will. Unless one is hell-bent on destruction. Then they'll both yield at the same time.</p><p></p><p>An accurate caliper can also be used to document case head expansion on the belt of belted cases, or just forward of the rim of the case head on non-belted cartridges. I use calipers when entering the world of the unknown in addition to monitoring primer seating resistance (or lack thereof).</p><p></p><p>Now I'm not saying one can equate cartridge case head expansion to quantitative pressures, such as that last powder charge produced case head expansion equivalent to 68,981 psi. But if one proceeds with 1/2 grain powder increment increases for mid-capacity cases, and even 1 grain powder increment increases for large capacity cases, while working up to a reasonable maximum pressure load - I believe that dangerous over-pressuring signs can be read and identified on a fired casing before the firearm is damaged and lets loose. And by monitoring the case over repetitive firings, as described above, one should be able to ensure a selected powder charge is safe for repetitive use. Because the brass casing will always fail before the steel, when the operating pressures begin to exceed the brass case head strength.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 375160, member: 4191"] I will offer a differing opinion and state that the weak point is always the brass casing in any modern day firearm. The case head and primer pocket will swell under repetitive firings before a bolt, barrel, or action rupture, for the observant reloader who works up a load cautiously, while observing primer pocket and case head swelling. Without the expensive pressure testing equipment, I know of no better method of monitoring pressure. The brass will yield before the steel will. Unless one is hell-bent on destruction. Then they'll both yield at the same time. An accurate caliper can also be used to document case head expansion on the belt of belted cases, or just forward of the rim of the case head on non-belted cartridges. I use calipers when entering the world of the unknown in addition to monitoring primer seating resistance (or lack thereof). Now I'm not saying one can equate cartridge case head expansion to quantitative pressures, such as that last powder charge produced case head expansion equivalent to 68,981 psi. But if one proceeds with 1/2 grain powder increment increases for mid-capacity cases, and even 1 grain powder increment increases for large capacity cases, while working up to a reasonable maximum pressure load - I believe that dangerous over-pressuring signs can be read and identified on a fired casing before the firearm is damaged and lets loose. And by monitoring the case over repetitive firings, as described above, one should be able to ensure a selected powder charge is safe for repetitive use. Because the brass casing will always fail before the steel, when the operating pressures begin to exceed the brass case head strength. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Custom action pressure ceiling.
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