  We study the infrared behavior of the effective Coulomb potential in lattice
SU(3) Yang-Mills theory in the Coulomb gauge. We use lattices up to a size of
48^4 and three values of the inverse coupling, beta=5.8, 6.0 and 6.2. While
finite-volume effects are hardly visible in the effective Coulomb potential,
scaling violations and a strong dependence on the choice of Gribov copy are
observed. We obtain bounds for the Coulomb string tension that are in agreement
with Zwanziger's inequality relating the Coulomb string tension to the Wilson
string tension.
