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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Practical advice with brass
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<blockquote data-quote="AZShooter" data-source="post: 1095345" data-attributes="member: 5219"><p>Is this a 25 degree or 30 degree shoulder 7mm-300 win mag? Do you know your reamer dimensions?</p><p></p><p>I figure you have read the author's article? In it he talks about what to use to size the fireformed brass. Copied below:</p><p></p><p>"Suitable neck dies include the Redding .300 Win Mag neck bushing die fitted with 7mm neck bushings, Forster 7mm Remington Magnum neck dies and the Hornady 7mm "Magnum" neck die. The Forster die has a 25 degree shoulder angle therefore it cannot fully size the neck shoulder junction of the Practical however this is not of great concern. A small portion of the lower neck (junction) can be left unsized without posing any negative effects.</p><p></p><p> If full length sizing is required, a .300 Win Mag or .338 Win Mag die can be used with the decapping spindle assembly removed. The shoulder dimensions are of no concern here, the die being used to decrease case body diameter."</p><p></p><p>link to entire article:</p><p></p><p><a href="http://www.ballisticstudies.com/Knowledgebase/7mm+Practical.html" target="_blank">7mm Practical</a></p><p></p><p></p><p>I have found bushing dies sometimes catch on the case mouth. I have considered grinding the opening of the bushing on one side creating a taper to help in necking down. Haven't done it yet. </p><p></p><p> You can use the a 7 mag seating die to partially reduce the 300's neck diameter before you try any bushing dies as you neck down to the final 7 mm bushing die. </p><p></p><p>Hopefully others will add more information.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1095345, member: 5219"] Is this a 25 degree or 30 degree shoulder 7mm-300 win mag? Do you know your reamer dimensions? I figure you have read the author's article? In it he talks about what to use to size the fireformed brass. Copied below: "Suitable neck dies include the Redding .300 Win Mag neck bushing die fitted with 7mm neck bushings, Forster 7mm Remington Magnum neck dies and the Hornady 7mm “Magnum” neck die. The Forster die has a 25 degree shoulder angle therefore it cannot fully size the neck shoulder junction of the Practical however this is not of great concern. A small portion of the lower neck (junction) can be left unsized without posing any negative effects. If full length sizing is required, a .300 Win Mag or .338 Win Mag die can be used with the decapping spindle assembly removed. The shoulder dimensions are of no concern here, the die being used to decrease case body diameter." link to entire article: [url=http://www.ballisticstudies.com/Knowledgebase/7mm+Practical.html]7mm Practical[/url] I have found bushing dies sometimes catch on the case mouth. I have considered grinding the opening of the bushing on one side creating a taper to help in necking down. Haven't done it yet. You can use the a 7 mag seating die to partially reduce the 300's neck diameter before you try any bushing dies as you neck down to the final 7 mm bushing die. Hopefully others will add more information. [/QUOTE]
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7mm Practical advice with brass
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