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Rifles, Reloading, Optics, Equipment
Reloading
300 RUM load development questions
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<blockquote data-quote="Bart B" data-source="post: 777878" data-attributes="member: 5302"><p>Good question.</p><p></p><p>Military match ammo (M118 and M852 7.62 NATO stuff as well as M72 .30-06) has a release force (neck tension, in MIL SPEC terms) of at least 40 pounds. Some of the stuff I've measured has a 10 to 15 pound spread above that. But it still shoots 7 inches at 600 yards with bullets not as good as Sierra's match bullets. With that ammo having a spread that big in that range, it must not have a big detrimental effect on accuracy.</p><p></p><p>Most long range competitors seat bullets in case necks sized to give about a 10 to 15 pound release force; that's enough to protect them in normal handling. Even with a 1/2 thousandth spread in neck wall thickness, the release force spread's gonna be no more than a few pounds.</p><p></p><p>Therefore, I'd put your neck tension concerns near bottom of your list of accurate ammo priorities. There's a greater spread in velocity caused by primer's spread in energy/heat release across a lot of them as well as the energy in exact charge weights of powder.</p></blockquote><p></p>
[QUOTE="Bart B, post: 777878, member: 5302"] Good question. Military match ammo (M118 and M852 7.62 NATO stuff as well as M72 .30-06) has a release force (neck tension, in MIL SPEC terms) of at least 40 pounds. Some of the stuff I've measured has a 10 to 15 pound spread above that. But it still shoots 7 inches at 600 yards with bullets not as good as Sierra's match bullets. With that ammo having a spread that big in that range, it must not have a big detrimental effect on accuracy. Most long range competitors seat bullets in case necks sized to give about a 10 to 15 pound release force; that's enough to protect them in normal handling. Even with a 1/2 thousandth spread in neck wall thickness, the release force spread's gonna be no more than a few pounds. Therefore, I'd put your neck tension concerns near bottom of your list of accurate ammo priorities. There's a greater spread in velocity caused by primer's spread in energy/heat release across a lot of them as well as the energy in exact charge weights of powder. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 RUM load development questions
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