  Calculations of hadron masses are done in quenched approximation using gauge
field and fermion actions which are both corrected for discretization errors to
$O(a^2)$ at the classical level and which contain tadpole improvement factors.
The fermion action has both nearest-neighbour and next-nearest-neighbour
couplings in the kinetic and Wilson terms. Simulations done at lattice spacings
of $0.27$ and $0.4$fm yield hadron masses which are already quite close to
experimental values. The results are compared to Wilson action calculations
done at comparable lattice spacings.
