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Message: <blockquote data-quote="SDMF" data-source="post: 439136" data-attributes="member: 412"><p>If your 1st “cold bore” shot is measurably outside your average group as thr bbl warms, IMO you’ve got a mechanical problem.</p><p></p><p>Scope bases</p><p>Scope rings</p><p>Bedding</p><p>Action screws</p><p></p><p>Or, less likely, you’ve got some stress in the bbl steel and you need a cryo treatment or a new tube.</p><p></p><p>Going back and forth between copper and cup and core projectiles doesn’t cause trouble in a good barrel either.  Tuesday I shot a .270Win I bought used.  It’s got a 6x42 Leupold in Talley lightweights.  130gn Hornady interlocks and 130gn TTSX with the same powder charge and same seating depth into the same group.  Doesn’t matter if it’s cold or HOT just keeps pounding bullets into the group.  As an aside, this is from the 2nd worst looking bore interior I’ve scoped.</p></blockquote><p></p>

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