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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Anyone own a 7mm 300 Win Mag?
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<blockquote data-quote="Petersen" data-source="post: 875513" data-attributes="member: 8372"><p>Don't remember if I already posted this, but when you neck this round down make sure you anneal the necks. If you don't, the necks may not be soft enough to stay expanded after firing. So, the bullets will not slide inside the fired case as they will after annealing. The hard brass essentially springs back to a size smaller than the neck area of the chamber.</p><p></p><p>I continued to turn mine down further than needed because I did not anneal after reducing the neck size. Then once I annealed, I now have a lot more clearance than needed.</p><p></p><p>I have experienced similar results in necking other calibers down and forming brass; 17 rem from 204, fireball from 223, 22.243 from 243, etc.</p></blockquote><p></p>
[QUOTE="Petersen, post: 875513, member: 8372"] Don't remember if I already posted this, but when you neck this round down make sure you anneal the necks. If you don't, the necks may not be soft enough to stay expanded after firing. So, the bullets will not slide inside the fired case as they will after annealing. The hard brass essentially springs back to a size smaller than the neck area of the chamber. I continued to turn mine down further than needed because I did not anneal after reducing the neck size. Then once I annealed, I now have a lot more clearance than needed. I have experienced similar results in necking other calibers down and forming brass; 17 rem from 204, fireball from 223, 22.243 from 243, etc. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Anyone own a 7mm 300 Win Mag?
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