We compute the three-loop leading-colour corrections to Yang-Mills Regge trajectory and gluon impact factor. Conjecturing that, in analogy with $\mathcal{N}=4$ super (SYM), a suitable scheme $N_c$-subleading terms are absent from trajectory, we understand our result as first computation of pure gauge, or $n_f = 0$, part QCD trajectory. The results presented both for bare renormalised amplitudes...