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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
which .30 cal would you use to push the new berger 245gr
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<blockquote data-quote="Bart B" data-source="post: 1818108" data-attributes="member: 5302"><p>The small ridge up to a few thousandths in front of the belt formed on first firing needs to be sized back down so it doesn't interfere with the chamber headspace ridge on every firing after resizing. Otherwise that ridge slams into the chamber headspace ridge causing unwanted barrel vibrations during barrel time. Accuracy is diminished a little. The Willis collet die fixes the problem sizing the case body next to the belt where regular dies don't. Use the collet die after a full length sizing bumped the fired case shoulder back a couple thousandths.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1818108, member: 5302"] The small ridge up to a few thousandths in front of the belt formed on first firing needs to be sized back down so it doesn't interfere with the chamber headspace ridge on every firing after resizing. Otherwise that ridge slams into the chamber headspace ridge causing unwanted barrel vibrations during barrel time. Accuracy is diminished a little. The Willis collet die fixes the problem sizing the case body next to the belt where regular dies don't. Use the collet die after a full length sizing bumped the fired case shoulder back a couple thousandths. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
which .30 cal would you use to push the new berger 245gr
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