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Rifles, Reloading, Optics, Equipment
Reloading
Better accuracy with Virgin Brass?
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<blockquote data-quote="MTLIVIN" data-source="post: 1180417" data-attributes="member: 42384"><p>I noticed with my semi-custom 7mm Rem Mag I get better accuracy and velocity spreads with virgin Norma brass. I shot my best groups ever with new brass, 180 hybrids, 215M, and H1000 that were under 0.2" @ 100 yards. With sized brass I get 0.5"-0.6".</p><p> </p><p>I've been very slightly bumping the shoulder back 0.001 using RCBS gold medal FL dies with a 0.003 undersized neck bushing and RCBS Gold Medal seating die. Everything I know tells me I should get better groups, not worst with sized brass. My 5-shot ES is 12fps w virgin brass, 40 with re-sized brass. Average velocity is 15 fps higher with sized brass. </p><p> </p><p>Gonna try a size smaller neck bushing, and maybe bumping back more and less, but without a gauge to measure run out I'm not sure what else to try, any suggestions?</p></blockquote><p></p>
[QUOTE="MTLIVIN, post: 1180417, member: 42384"] I noticed with my semi-custom 7mm Rem Mag I get better accuracy and velocity spreads with virgin Norma brass. I shot my best groups ever with new brass, 180 hybrids, 215M, and H1000 that were under 0.2" @ 100 yards. With sized brass I get 0.5"-0.6". I've been very slightly bumping the shoulder back 0.001 using RCBS gold medal FL dies with a 0.003 undersized neck bushing and RCBS Gold Medal seating die. Everything I know tells me I should get better groups, not worst with sized brass. My 5-shot ES is 12fps w virgin brass, 40 with re-sized brass. Average velocity is 15 fps higher with sized brass. Gonna try a size smaller neck bushing, and maybe bumping back more and less, but without a gauge to measure run out I'm not sure what else to try, any suggestions? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Better accuracy with Virgin Brass?
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