  We show how one may test macroscopic local realism where, different from
conventional Bell tests, all relevant measurements need only distinguish
between two macroscopically distinct states of the system being measured. Here,
measurements give macroscopically distinguishable outcomes for a system
observable and do not resolve microscopic properties (of order $\hbar$).
Macroscopic local realism assumes: (1) macroscopic realism (the system prior to
measurement is in a state which will lead to just one of the macroscopically
distinguishable outcomes) and (2) macroscopic locality (a measurement on a
system at one location cannot affect the macroscopic outcome of the measurement
on a system at another location, if the measurement events are spacelike
separated). To obtain a quantifiable test, we define $M$-scopic local realism
where the outcomes are separated by an amount $\sim M$. We first show for $N$
up to $20$ that $N$-scopic Bell violations are predicted for entangled
superpositions of $N$ bosons (at each of two sites). Secondly, we show
violation of $M$-scopic local realism for entangled superpositions of coherent
states of amplitude $\alpha$, for arbitrarily large $M=\alpha$. In both cases,
the systems evolve dynamically according to a local nonlinear interaction. The
first uses nonlinear beam splitters realised through nonlinear Josephson
interactions; the second is based on nonlinear Kerr interactions. To achieve
the Bell violations, the traditional choice between two spin measurement
settings is replaced by a choice between different times of evolution at each
site.
