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"Headspace" is defined exactly the same way for both actions, breach to shoulder datum
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You are correct, but the machining differences between the breech face and the barrel hinge on single-shots exacerbate that breech-to-shoulder length variation.
As to your 15" Encore 7mm-08 - I wish I could get mine to group like that. I've only had it out once but I suspect my problem is in the scope or the mount rather than the gun itself.