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We report on the suppression of the metal-insulator transition (MIT) in polycrystalline samples of Nd₂Ir₂O₇ under substitution of Nd for Ca. Each calcium ion effectively dopes one hole on an Ir⁴⁺ (5d⁴, j_eff=1/2) site, mediating a filling-controlled Mott-like transition. Ca substitution also changes bandwidth by modulating Ir-O bond lengths and angles, without altering site symmetry. Local structure and absorption spectroscopy confirm that Ca substitution does not result in phase separation or large changes to Ir electronic configuration. The MIT has a coincident antiferromagnetic transition on the Ir sublattice (T_N = T_MIT) for all measured samples, which both decrease with Ca content. Weak low-temperature upturns in susceptibility and resistivity for samples with high Ca content suggest that Nd sublattice magnetism couples to carriers in the metallic regime.