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Rifles, Reloading, Optics, Equipment
Reloading
Neck Tension Effect on Accuracy
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<blockquote data-quote="Stoneke" data-source="post: 1252888" data-attributes="member: 97062"><p>I have been working with my Winchester 70 Ext Weather in 7mm RM over the past several months and have been perplexed with changes in group size. After carefully breaking-in the barrel, I found a very accurate load of 68.6 H1000 in Nosler cases with a Hornady 162 ELD-X bullet and F215 primer. My 3 shot groups were 9/16 to 3/4 inch. </p><p></p><p>During later range sessions I found that groups had opened up to 1 1/2 to 2 inches.</p><p>Looking back trying to analyze what changed, I realized that I had switched to Forster bushing dies, and that I was carefully setting the neck tension at .002. Comparing that tension to my initial Redding FL dies, I saw that my polished expander ball was giving me .004 tension. So, would that increase in the initial neck tension produce better burning of the powder and better accuracy? Nothing else has changed - charges, cases, bullets all weighed and segregated and necks turned on the cases. </p><p></p><p>I can't get to the range for several days, but I'm intending on loading several rounds with tighter neck tension than .002. Any thoughts on this dilemma???</p></blockquote><p></p>
[QUOTE="Stoneke, post: 1252888, member: 97062"] I have been working with my Winchester 70 Ext Weather in 7mm RM over the past several months and have been perplexed with changes in group size. After carefully breaking-in the barrel, I found a very accurate load of 68.6 H1000 in Nosler cases with a Hornady 162 ELD-X bullet and F215 primer. My 3 shot groups were 9/16 to 3/4 inch. During later range sessions I found that groups had opened up to 1 1/2 to 2 inches. Looking back trying to analyze what changed, I realized that I had switched to Forster bushing dies, and that I was carefully setting the neck tension at .002. Comparing that tension to my initial Redding FL dies, I saw that my polished expander ball was giving me .004 tension. So, would that increase in the initial neck tension produce better burning of the powder and better accuracy? Nothing else has changed - charges, cases, bullets all weighed and segregated and necks turned on the cases. I can't get to the range for several days, but I'm intending on loading several rounds with tighter neck tension than .002. Any thoughts on this dilemma??? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck Tension Effect on Accuracy
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