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Long Range Hunting & Shooting
McGuire Ballistics 6.5 PRC load workup!
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<blockquote data-quote="Idaho Trecker" data-source="post: 3047026" data-attributes="member: 67706"><p>I will. I don't know what you decided for your next 338 build... I won't derail this thread on the 338 stuff. </p><p></p><p>Some small amount of data I have on n555 isn't at all conclusive but more apples to oranges so far. I think you would do well with n555 in your application here. </p><p></p><p>300ss 178 eldm virgin brass is the 40 degree but I'm shooting it in the first rifle chambered for it which has a very different chamber than now so I still fireformed it going easy. My fireforming load was 59 grains of h4831sc with a .030" jam gave me 2720 fps. Once fired with a .015" jump of the same 59 grain load of n555 gave me 2864 fps and no perceived pressure signs. Like I said not a direct comparison between powders but I like it so far. Temp testing to come.</p></blockquote><p></p>
[QUOTE="Idaho Trecker, post: 3047026, member: 67706"] I will. I don't know what you decided for your next 338 build... I won't derail this thread on the 338 stuff. Some small amount of data I have on n555 isn't at all conclusive but more apples to oranges so far. I think you would do well with n555 in your application here. 300ss 178 eldm virgin brass is the 40 degree but I'm shooting it in the first rifle chambered for it which has a very different chamber than now so I still fireformed it going easy. My fireforming load was 59 grains of h4831sc with a .030" jam gave me 2720 fps. Once fired with a .015" jump of the same 59 grain load of n555 gave me 2864 fps and no perceived pressure signs. Like I said not a direct comparison between powders but I like it so far. Temp testing to come. [/QUOTE]
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McGuire Ballistics 6.5 PRC load workup!
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