Would put money on it being Hornady lack of quality control, their brass seems to be undersize quite often, which makes it look like excess headspace - seen it in several calibers now. Someone at the range just the other day was having this issue but with 300blk. I've had it in 7x64 (not leaking primers fortunately). Likely your rifle is fine, especially if it looks ok with Winchester. They make good projs, but I'll give their ammo a miss from now on, not that I use factory stuff often fortunately.
Bolt etching is annoying rather than a real mechanical issue, but still hit them up about it. Like others have said it wasn't like that before, so why should you be stuck with it like that now?
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