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Rifles, Reloading, Optics, Equipment
Reloading
Standard Deviation & Extreme Spread - What does it take?
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<blockquote data-quote="cycloneshooter" data-source="post: 1333787" data-attributes="member: 62578"><p>I did a little 7mmRemMag measuring tonight. Nosler brass and get a .313 seated bullet outside neck diameter. 0.002 neck tension would suggest a .311 bushing. Measured a FL sized brass from a standard Redding FL die and outside neck diameter was already the .311. So I already have the .002 neck tension.</p><p></p><p>So a bushing die would really on gain me concentricity and less brass working correct? Not sure thats my SD/ES issue source...</p><p></p><p>Did get some better numbers with the 280AI sunday. Got 6/21 and 8/27, lots better that the 15/45ish I have been getting. Took some time brushing inside case necks and polished expander ball.</p><p></p><p>7mmRemMag was still 18/48, but I believe I am over pressure. 68.8gr H1000, 162gr ELDX, but still showing 3075fps w 26" barrel. Brass and bolt lift not showing pressure signs, but had one shot 130fps low and one shot 230fps high. I discarded those 2 shots, and the remaining 8 still showed 18/48. Hoping a back off in charge will help the SD/ES numbers...</p></blockquote><p></p>
[QUOTE="cycloneshooter, post: 1333787, member: 62578"] I did a little 7mmRemMag measuring tonight. Nosler brass and get a .313 seated bullet outside neck diameter. 0.002 neck tension would suggest a .311 bushing. Measured a FL sized brass from a standard Redding FL die and outside neck diameter was already the .311. So I already have the .002 neck tension. So a bushing die would really on gain me concentricity and less brass working correct? Not sure thats my SD/ES issue source... Did get some better numbers with the 280AI sunday. Got 6/21 and 8/27, lots better that the 15/45ish I have been getting. Took some time brushing inside case necks and polished expander ball. 7mmRemMag was still 18/48, but I believe I am over pressure. 68.8gr H1000, 162gr ELDX, but still showing 3075fps w 26" barrel. Brass and bolt lift not showing pressure signs, but had one shot 130fps low and one shot 230fps high. I discarded those 2 shots, and the remaining 8 still showed 18/48. Hoping a back off in charge will help the SD/ES numbers... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Standard Deviation & Extreme Spread - What does it take?
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