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Old May 27, 2013, 05:35 PM   #11
Picher
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Join Date: December 14, 2004
Location: Maine
Posts: 2,768
Heating a barrel can cause it to warp a bit, but even if it doesn't touch the barrel channel, the barrel whips when fired, so some heavier hunting calibers need at least 1/16" of clearance at all times. Most rifles don't have that much clearance from the factory, some are bearing at some point along the channel.

In this particular case; however, barrel fouling may be the culprit. Barrels are more likely to foul when new, especially if heated too much.
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