Osterweil v. Barrett concerns possession of a handgun - the OP was asking about long gun(s). The laws governing handguns and long guns are radically different in NY.
To the best of my knowledge, there is no prohibition on a non-resident bringing a long gun into NYS, provided it is unloaded when being transported. That assumes the gun is legal in NY the first place, of course, so I would not bring bring any of the "modern sporting rifles" into the state under any circumstances.
IANAL
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