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Rifles, Reloading, Optics, Equipment
Reloading
Cold weather contraction?
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<blockquote data-quote="Lefty7mmstw" data-source="post: 862191" data-attributes="member: 48043"><p>You've got interference earlier than you thought you did. New box of bullets possibly?? The oal may be the same but the ogive may be different if a different pointing die was used. Back 'em up a bit and you'll be fine. </p><p> </p><p>I shoot to twenty below zero here and I've never had that issue even with my 300 win at .010 off the lands. Unlikely it's metal contraction as the ammo does to,although steel and copper have slightly different expansion coefficients. 7.3 for steel and 9 for copper (9.3 for cupronickel).</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 862191, member: 48043"] You've got interference earlier than you thought you did. New box of bullets possibly?? The oal may be the same but the ogive may be different if a different pointing die was used. Back 'em up a bit and you'll be fine. I shoot to twenty below zero here and I've never had that issue even with my 300 win at .010 off the lands. Unlikely it's metal contraction as the ammo does to,although steel and copper have slightly different expansion coefficients. 7.3 for steel and 9 for copper (9.3 for cupronickel). [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Cold weather contraction?
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