It depends where you are, and how local authority interprets their laws.
Carried "openly" usually means visible, on the outer layer of clothing. In other words, obvious to a "reasonable person".
BUT, there are variations possible. That full flap holster, worn openly on the belt is open carry, until you put you coat on. Then, since your coat partially covers the holster, in some places it is considered concealed.
If you want general advice, if it doesn't obviously look like a gun, it could be considered concealed. If you desire actual legal advice, talk to an actual lawyer.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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