In order to explore quantum spin ice physics, we wish to focus on the non-Kramers Pr-based pyrochlores with general formula Pr2M2O7 (M =Sn, Zr, Hf). There is a recent theoretical prediction of the existence of various quantum ground states in this family: a U(1) quantum spin liquid, antiferro-quadrupolar order and non-coplanar ferro-quadrupolar order. Adjusting M in Pr2M2O7 allows the crystal field to be tuned, thus adjusting the dynamics and thereby potentially exploring the generalised phase diagram. Experiments have already been performed on the Sn compound, demonstrating the feasibility of our approach. Pr is chosen to synthesise quantum spin ice materials because its smaller moment and number of f electrons leads to a smaller Ising barrier, thereby permitting quantum-mechanical tunnelling between different ice configurations.