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My understanding on the problem of walking on barrel heat is not the heat but a barrel that was not stress relieved. Seem's I also read that all barrle's havw been stress relieved for a lot of years nor. I had a rifle, 308, back in the late 1060's that walked bullet's after to first two or three all over. Checked with a gunsmith back then and he told me it was likely not stress relieved. What I would think today if a barrel started walking bullets when hot is a bedding problem. When I bed my rifle barrels I make sure there is plenty of room in the stock around the barrel. The old idea a slide a dollar bill up it without touching I gave up on years ago. Today I fold a dollar length wise three time's and use it.
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