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Rifles, Reloading, Optics, Equipment
Reloading
7mm-300WSM wildcat
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<blockquote data-quote="nheninge" data-source="post: 269015" data-attributes="member: 13085"><p>I am starting my first wildcat project. I am having a fully chambered 7mm-300wsm being built and I want to neck down 300 wsm cases to 7mm (this is not just prepping 300 wsm brass to eventually fit a 7mm wsm). </p><p></p><p>My usual new brass prep (not specifically in this order but...):</p><p>Norma brass preferred, winchester as a last resort</p><p>sinclair expander mandrel</p><p>flash hole debur</p><p>sorting by neck variance (keep cases with < 0.0015) </p><p>weight sort (remove top and bottom 5%)</p><p>neck turn to uniform neck thickness</p><p>resize</p><p>primer pocket uniform</p><p>trim to uniform length</p><p>outside debur</p><p>polish w/ 0000 steel wool</p><p></p><p>I need input specifically regarding:</p><p></p><p>Should I neck turn the 300 WSM, followed by necking down to 7mm </p><p></p><p>OR</p><p></p><p>Neck down the 300wsm and then neck turn the 7mm after case forming?</p><p></p><p>I will be using redding S type FL sizing dies w/ bushings.</p><p>What increments should be used to minimize work hardening?</p><p>Neck ream to minimize doughnut? When?</p><p></p><p>Since this cartridge is not uncommon, any help/experience is appreciated.</p></blockquote><p></p>
[QUOTE="nheninge, post: 269015, member: 13085"] I am starting my first wildcat project. I am having a fully chambered 7mm-300wsm being built and I want to neck down 300 wsm cases to 7mm (this is not just prepping 300 wsm brass to eventually fit a 7mm wsm). My usual new brass prep (not specifically in this order but...): Norma brass preferred, winchester as a last resort sinclair expander mandrel flash hole debur sorting by neck variance (keep cases with < 0.0015) weight sort (remove top and bottom 5%) neck turn to uniform neck thickness resize primer pocket uniform trim to uniform length outside debur polish w/ 0000 steel wool I need input specifically regarding: Should I neck turn the 300 WSM, followed by necking down to 7mm OR Neck down the 300wsm and then neck turn the 7mm after case forming? I will be using redding S type FL sizing dies w/ bushings. What increments should be used to minimize work hardening? Neck ream to minimize doughnut? When? Since this cartridge is not uncommon, any help/experience is appreciated. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
7mm-300WSM wildcat
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