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Rifles, Reloading, Optics, Equipment
7mm STW
7mm advice
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<blockquote data-quote="MudRunner2005" data-source="post: 938111" data-attributes="member: 12995"><p>I know my .25-06 Ackley & .30-06 Ackley brass shrinks the neck .0200" when fire-forming. But my belted .300 Ackley Improved Magnum pushes the brass forward when it forms the shoulder, because it headspaces off the belt.</p><p> </p><p>With belted cartridges it doesn't hurt anything for the cases to expand forward during fire-forming, it's what they're designed to do.</p><p> </p><p>Personally, I wouldn't own a short magnum, unless it was the wildcat 6.5 SS (Sherman Shortmag). But that involves a whole lot of forming and brass prep work.</p><p> </p><p>I personally wouldn't worry too much about .018" stretch unless that stretch starts showing the signs of a case/head separation. But that's just me.</p><p> </p><p>I also think most new brass stretches alot more than most people realize. Remember, it has to be small enough to fit in everyone's gun world-wide. They have to leave wiggle-room so that it will work with no issues.</p><p> </p><p>Have you tried comparing a new piece of brass and measuring it next to a SAAMI spec printout of the 7mm RemMag case dimensions? I bet the new brass will be significantly smaller.</p></blockquote><p></p>
[QUOTE="MudRunner2005, post: 938111, member: 12995"] I know my .25-06 Ackley & .30-06 Ackley brass shrinks the neck .0200" when fire-forming. But my belted .300 Ackley Improved Magnum pushes the brass forward when it forms the shoulder, because it headspaces off the belt. With belted cartridges it doesn't hurt anything for the cases to expand forward during fire-forming, it's what they're designed to do. Personally, I wouldn't own a short magnum, unless it was the wildcat 6.5 SS (Sherman Shortmag). But that involves a whole lot of forming and brass prep work. I personally wouldn't worry too much about .018" stretch unless that stretch starts showing the signs of a case/head separation. But that's just me. I also think most new brass stretches alot more than most people realize. Remember, it has to be small enough to fit in everyone's gun world-wide. They have to leave wiggle-room so that it will work with no issues. Have you tried comparing a new piece of brass and measuring it next to a SAAMI spec printout of the 7mm RemMag case dimensions? I bet the new brass will be significantly smaller. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
7mm STW
7mm advice
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