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Rifles, Reloading, Optics, Equipment
Reloading
Video On Bump sizing cases.
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<blockquote data-quote="J E Custom" data-source="post: 1842926" data-attributes="member: 2736"><p>The reason for pulling the firing pin assembly Is safety and feel. the cocking piece will engage with the trigger and give a false sense of feel. As described, the bolt should be free of any out side influences to get the best results and consistent readings. The reason we leave the extractor in the bolt is for extraction and it does not effect the cartridge/case.</p><p></p><p>Also to deal with fixed firing pins all gauges should have a firing pin relief drilled in the case head portion of the gauge that allows the bolt to go into battery with the exposed firing pin without contact with the head space gauge. Some leave the firing pin assembly In but don't attach the trigger, but unless you un cock the bolt. it is still cocked and at minimum can/may/damage the firing pin if it fell by accident, so It is best to remove the firing pin anyway.</p><p></p><p>Sometimes when setting head space, a loaded round is used for reference to see how tight you can set the head space with the go gauge for that brand of ammo. So it is always a good practice to remove the firing pin and and trigger because, (Sometimes the manufacture of the ammo sizes to the max length and if the chamber is cut to the minimum length, chambering this type of a round can be difficult.</p><p></p><p>So when setting head space it is best to remove any component that can effect the reading.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1842926, member: 2736"] The reason for pulling the firing pin assembly Is safety and feel. the cocking piece will engage with the trigger and give a false sense of feel. As described, the bolt should be free of any out side influences to get the best results and consistent readings. The reason we leave the extractor in the bolt is for extraction and it does not effect the cartridge/case. Also to deal with fixed firing pins all gauges should have a firing pin relief drilled in the case head portion of the gauge that allows the bolt to go into battery with the exposed firing pin without contact with the head space gauge. Some leave the firing pin assembly In but don't attach the trigger, but unless you un cock the bolt. it is still cocked and at minimum can/may/damage the firing pin if it fell by accident, so It is best to remove the firing pin anyway. Sometimes when setting head space, a loaded round is used for reference to see how tight you can set the head space with the go gauge for that brand of ammo. So it is always a good practice to remove the firing pin and and trigger because, (Sometimes the manufacture of the ammo sizes to the max length and if the chamber is cut to the minimum length, chambering this type of a round can be difficult. So when setting head space it is best to remove any component that can effect the reading. J E CUSTOM [/QUOTE]
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Video On Bump sizing cases.
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