The results of experiments and numerical simulations of a shock wave propagation between either conical or parabolic bounding walls are presented. The shock wave was generated by a microsecond timescale underwater electrical explosion of a cylindrical wire array supplied by a current pulse having an amplitude of ~230 kA and rise time of ~1 microsecond. It is shown that with the same energy density depositon into the exploding wire array, the shock wave converges faster between parabolic walls, and as a result, the pressure in the vicinity of convergence is ~2.3 times higher than in the case of conical walls. The results obtained are compared to those of earlier experiments with explosions of spherical wire arrays. It is shown that at a distance of ~400 microns from the implosion origin the pressure obtained in the current experiments is higher than for the case of spherical wire arrays.