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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: 777528" data-attributes="member: 5302"><p>I'm a believer that reamers that make tight chamber necks and neck only sizing dies are best used as door stops, paper weights or in ammo for large bore shotguns.</p><p></p><p>Most anything that goes through the inside of a sized down case neck will bend it off its sized axis a full length bushing die positioning it perfectly. At least on all the ones I've measured. Use a bushing diamter that make case neck tension what you want.</p><p></p><p>It doesn't matter how much neck clearance there is on bottleneck cases headspacing on their shoulder. As the round's shoulder is perfectly centered in the chamber shoulder when fired, it's the off-center misalignment of case necks on case shoulders that causes problems. Proper use of full length dies without expanders makes case necks better centered on case shoulders than neck only sizing dies. Neck only dies do not hold the case body well aligned with its neck sizing hole.</p><p></p><p>After all, a chambered round's neck doesn't touch the chamber neck anyway when the round's fired so why all the need for tight neck chambers? The only time a case neck might touch the chamber neck is after the bullet's left the case mouth and well into the rifling.</p></blockquote><p></p>
[QUOTE="Bart B, post: 777528, member: 5302"] I'm a believer that reamers that make tight chamber necks and neck only sizing dies are best used as door stops, paper weights or in ammo for large bore shotguns. Most anything that goes through the inside of a sized down case neck will bend it off its sized axis a full length bushing die positioning it perfectly. At least on all the ones I've measured. Use a bushing diamter that make case neck tension what you want. It doesn't matter how much neck clearance there is on bottleneck cases headspacing on their shoulder. As the round's shoulder is perfectly centered in the chamber shoulder when fired, it's the off-center misalignment of case necks on case shoulders that causes problems. Proper use of full length dies without expanders makes case necks better centered on case shoulders than neck only sizing dies. Neck only dies do not hold the case body well aligned with its neck sizing hole. After all, a chambered round's neck doesn't touch the chamber neck anyway when the round's fired so why all the need for tight neck chambers? The only time a case neck might touch the chamber neck is after the bullet's left the case mouth and well into the rifling. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 RUM load development questions
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