Nuclear matter calculations have been carried out for the Reid, Hamada–Johnston, and Bressel–Kerman–Rouben potentials. The convergence of the reference spectrum series for the G matrix is investigated, as is the approximation of choosing an average center of mass momentum. Higher-order cluster contributions are estimated from the scaling formulas of Day. The Reid potential predicts saturation at kF = 1.49 fm−1, with a binding energy −13.7 ± 1.5 MeV per particle.