I saw this happen a long time ago in Hawaii with a Ruger 77. Shot crappy until it warmed up ---then fine. The barrel wasn`t bored/rifled correctly or stress releived at the factory. In the "relaxed" state[cool] was was a tad bent. Upon heating up it straightened out and shot. If I have a spare Rem 700 7mm RM barrel you can have it for the S/h if you have a `smith to install it. I think this will solve the problem.
Aloha, Mark
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