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Rifles, Reloading, Optics, Equipment
Reloading
7mm rem mag bullet pull
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<blockquote data-quote="MagnumManiac" data-source="post: 1179528" data-attributes="member: 10755"><p>Not all neck tension is equal, to get the exact same tension, regardless of intereference fit, the brass would first have to have the same neck wall thickness, and then, more importantly, hardness. Soft brass provides less tension, hard brass provides more tension, but less deflection.</p><p>This is why we run .001"-.005" neck reduction.</p><p>I have 2 barrels in 300WM, the lightweight barrel likes firm seating @ .003" reduction in annealed brass, the heavy barrel likes no more than .0015" reduction, and the groups stay the same at .001".</p><p>You do realise that it really is a moot point, because the neck only holds the bullet for the primer ignition, as soon as the case pressurises, the neck is the first thing to expand and releases bullet grip very early on in the ignition process.</p><p>In reallity, neck tension only needs to resist primer ignition and to stop bullets falling out.</p><p>Distance from the rifling is more important to group size than neck tension in most situations.</p><p>If you feel that 100lbs is necessary then use it.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1179528, member: 10755"] Not all neck tension is equal, to get the exact same tension, regardless of intereference fit, the brass would first have to have the same neck wall thickness, and then, more importantly, hardness. Soft brass provides less tension, hard brass provides more tension, but less deflection. This is why we run .001"-.005" neck reduction. I have 2 barrels in 300WM, the lightweight barrel likes firm seating @ .003" reduction in annealed brass, the heavy barrel likes no more than .0015" reduction, and the groups stay the same at .001". You do realise that it really is a moot point, because the neck only holds the bullet for the primer ignition, as soon as the case pressurises, the neck is the first thing to expand and releases bullet grip very early on in the ignition process. In reallity, neck tension only needs to resist primer ignition and to stop bullets falling out. Distance from the rifling is more important to group size than neck tension in most situations. If you feel that 100lbs is necessary then use it. Cheers. gun) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
7mm rem mag bullet pull
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