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Rifles, Reloading, Optics, Equipment
Reloading
Look at the Difference in Brass Softness!
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<blockquote data-quote="bigedp51" data-source="post: 1893975" data-attributes="member: 28965"><p>Sticky bolt lift is also called primary extraction, meaning lifting the bolt straight up is to break the cartridge free of the chamber walls. Secondary extraction is being able to pull straight back on the bolt and eject the case.</p><p></p><p>In a semi-auto the resized case should be .003 to .005 smaller in diameter that its fired diameter. This allow the case to spring back from the chamber walls and extract reliably.</p><p></p><p>So sticky bolt lift could also be caused by not reducing the case diameter enough during full length resizing. But the general consensus is sticky bolt lift is caused by high pressure that also can vary with brass hardness.</p><p></p><p>In the 1968 Congressional hearings on the M16 rifles jamming problem, one of the problems was brass hardness. Meaning the brass was too soft and now Lake City has the hardest brass.</p><p></p><p><img src="https://i.imgur.com/suc7fK5.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://i.imgur.com/OujD1z7.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The photo below was posted at accurateshooter.com and this long range shooter said in increased the load until he got ejector marks. He then reduced the load knowing the elastic limits of the brass.</p><p></p><p><img src="https://i.imgur.com/KtO65uH.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1893975, member: 28965"] Sticky bolt lift is also called primary extraction, meaning lifting the bolt straight up is to break the cartridge free of the chamber walls. Secondary extraction is being able to pull straight back on the bolt and eject the case. In a semi-auto the resized case should be .003 to .005 smaller in diameter that its fired diameter. This allow the case to spring back from the chamber walls and extract reliably. So sticky bolt lift could also be caused by not reducing the case diameter enough during full length resizing. But the general consensus is sticky bolt lift is caused by high pressure that also can vary with brass hardness. In the 1968 Congressional hearings on the M16 rifles jamming problem, one of the problems was brass hardness. Meaning the brass was too soft and now Lake City has the hardest brass. [IMG]https://i.imgur.com/suc7fK5.jpg[/IMG] [IMG]https://i.imgur.com/OujD1z7.jpg[/IMG] The photo below was posted at accurateshooter.com and this long range shooter said in increased the load until he got ejector marks. He then reduced the load knowing the elastic limits of the brass. [img]https://i.imgur.com/KtO65uH.jpg[/img] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Look at the Difference in Brass Softness!
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