chizelhead
WKR
Another system is the Wheeler leveling kit. I set my rifle in the cleaning stand to level. A vise would work as well.
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Is eyeballing good enough? Yes! Does it annoy the piss out of me when a week later I notice the 5ish degree offset from eyeballing for some reason? Also yes.
...and (with practice) it does get better over time.If you use a scope level on your rifle and check it prior to every shot you will probably observe that your natural cant is not consistent.
Is eyeballing good enough? Yes! Does it annoy the piss out of me when a week later I notice the 5ish degree offset from eyeballing for some reason?
Well, I have days, weeks, months too look at it in various settings, rather than a few minutes in a single setting.So you can do focused eyeballing of it and mount it to look as plumb to bore as you could visually discern but then days down the road you know its canted just from shouldering and looking through your optic after the fact? How does that work?

When I purposely unfocus my eyes I can easily tell they're parallel, but when they're focused they look canted as hell. And now I can't get them refocused and feel cross eyed the night before rifle elk opener. Thanks.Well, I have days, weeks, months too look at it in various settings, rather than a few minutes in a single setting.
Eyeballing is rather flawed. The same flaws can make something set correctly look off. An extra 30 seconds spares a lot of potential annoyance for me and is much less effort than repeatedly reminding myself why it is good enough.
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