  The masses of neutron stars in neutron star binaries are observed to fall in
a narrow mass range around $\sim 1.33$ M$_{\odot}$. We explore the advantage of
focusing on this region of the parameter space in gravitational wave searches.
We find that an all-sky (externally triggered) search with optimally reduced
template bank is expected to detect $14\%$ ($61\%$) more binary mergers than
without the reduction. A reduced template bank can also represent significant
improvement in technical cost. We also develop a more detailed search method
using binary mass distribution, and find similar sensitivity increase to that
due to the reduced template bank.
