I suppose that anything can happen. Maybe the customer sighted in while resting the rifle way back near the magazine and of course the sling and hand were far forward.
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<br>Lot's of other things could have happend like something coming loose and the rifle and you got blamed.
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<br>I like to shoot my varmint rifles with a sling. I sight them in off sand bags on the bench however but the barrels are heavy ones.
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<br>I may run a test for you this week. It will be good practice anyway.