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Rifles, Reloading, Optics, Equipment
Reloading
High velocity
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<blockquote data-quote="johnnyk" data-source="post: 2313908" data-attributes="member: 307"><p>The first thing that came to mind was your brass necks are getting thicker, causing excessive pressure. Hence the reason for 100fps velocity increase and accuracy gone to $4!+. The excess pressure has pushed your formerly golden load out of its node. "Not possible", you say, "with only two firings" but I think it depends on the brass.</p><p>I have experienced the above with my .270 Allen Magnum, using Norma .300 RUM brass. Initially, the virgin brass is run through the sizing die just enough to get it to fit the chamber where it can be fireformed w/COW method. I think I had about two firings on the Norma brass and I experienced what you described.</p><p>I had shot a couple/three rounds at a buddy's range and couldn't understand why I could barely connect on his 500yd gong. He and I were bouncing ideas around and he tried to put a .270 150gn Ballistic Tip bullet in one of my fired cases but it wouldn't begin to fit. All kinds of bells and whistle went off; .300 RUM necked down to .270, necks not turned, more than likely a tight chamber (Kirby built) or at best NO slop. After turning my brass necks down, my load has settled down and gone back to it's original accuracy.</p><p>Try a bullet first, then measure your neck thickness with ball micrometer.</p></blockquote><p></p>
[QUOTE="johnnyk, post: 2313908, member: 307"] The first thing that came to mind was your brass necks are getting thicker, causing excessive pressure. Hence the reason for 100fps velocity increase and accuracy gone to $4!+. The excess pressure has pushed your formerly golden load out of its node. "Not possible", you say, "with only two firings" but I think it depends on the brass. I have experienced the above with my .270 Allen Magnum, using Norma .300 RUM brass. Initially, the virgin brass is run through the sizing die just enough to get it to fit the chamber where it can be fireformed w/COW method. I think I had about two firings on the Norma brass and I experienced what you described. I had shot a couple/three rounds at a buddy's range and couldn't understand why I could barely connect on his 500yd gong. He and I were bouncing ideas around and he tried to put a .270 150gn Ballistic Tip bullet in one of my fired cases but it wouldn't begin to fit. All kinds of bells and whistle went off; .300 RUM necked down to .270, necks not turned, more than likely a tight chamber (Kirby built) or at best NO slop. After turning my brass necks down, my load has settled down and gone back to it's original accuracy. Try a bullet first, then measure your neck thickness with ball micrometer. [/QUOTE]
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