Experiments were undertaken to understand forging and heat treatment conditions that give rise to large, visible grains in a nickel alloy after super-solvus heat treatment. Such grains are undesirable as they can reduce material properties. The information from experiments is required to design a forging practice to manufacture closed die forgings. The alloy is a development composition, which contains about 51 % gamma prime and has been produced by powder metallurgy. Compression tests were conducted to specified upsets on right circular cylinder and double cone test pieces. Segments of these were super-solvus solution heat treated and examined to characterise grain size. The results of these experiments are understood having reviewed billet microstructure, the results of process simulations, and the results of electron backscattered diffraction on forged material.