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The Range
Ammo & Reloading
Signs of over pressure
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<blockquote data-quote="TheDoubleD" data-source="post: 3445620" data-attributes="member: 43754"><p>Pressure looks something like these.</p><p></p><p><img src="https://www.okshooters.com/data/MetaMirrorCache/www.fototime.com_F4B0C6C5E4DC96F_standard.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The first one on the left shows a touch of what appears to be excess headspace in the backed out primer. Primer isn't flattened.</p><p></p><p>Middle has flattened primer partial head separation. This is definitely a sign of over pressure.</p><p></p><p>The one on the right fully flattened primer, pierced primer and almost full head separation. Classic pressure signs.</p><p></p><p>Go back and look at the first case again, it shows the ring from head separation starting also. This is an over pressure sign.</p><p></p><p>The backed out primer is misleading as this design gun has generous headspace. Maximum go gauge is .010 and backed out primers is a characteristic.</p><p></p><p>These three cartridges .303 British were fire one after another in a Martini hinge block single shot rifle made around 1889-1890. The gun is marked. "ammunition: .303" The groove diameter of this gun is .303. The .303 British cartridge uses a .311 diameter bullet. Overpressure from firing an oversized .311 bullet in .303 groove barrel.</p><p></p><p>When the British first developed the .303 British cartridge the experimente with .303, .307 and .311 groove barrels. When finally introduced in 1892/93 they settled on a .311 groove.</p></blockquote><p></p>
[QUOTE="TheDoubleD, post: 3445620, member: 43754"] Pressure looks something like these. [IMG]https://www.okshooters.com/data/MetaMirrorCache/www.fototime.com_F4B0C6C5E4DC96F_standard.jpg[/IMG] The first one on the left shows a touch of what appears to be excess headspace in the backed out primer. Primer isn't flattened. Middle has flattened primer partial head separation. This is definitely a sign of over pressure. The one on the right fully flattened primer, pierced primer and almost full head separation. Classic pressure signs. Go back and look at the first case again, it shows the ring from head separation starting also. This is an over pressure sign. The backed out primer is misleading as this design gun has generous headspace. Maximum go gauge is .010 and backed out primers is a characteristic. These three cartridges .303 British were fire one after another in a Martini hinge block single shot rifle made around 1889-1890. The gun is marked. "ammunition: .303" The groove diameter of this gun is .303. The .303 British cartridge uses a .311 diameter bullet. Overpressure from firing an oversized .311 bullet in .303 groove barrel. When the British first developed the .303 British cartridge the experimente with .303, .307 and .311 groove barrels. When finally introduced in 1892/93 they settled on a .311 groove. [/QUOTE]
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