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...you could start here: http://smartgunlaws.org/gun-laws/policy-areas/firearms-in-public-places/open-carrying/
If you have any doubts, I would suggest making a call to a local law enforcement office to resolve any questions. I would also at all times handle as if loaded keeping the lever/breach in the open position and unloaded.
It might be considerate as well to check in with the management at the grocery. 
Looks like a very nice rifle. Best of luck. 
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