As NoSecondBest and my good friend Pahoo suggested,buying the .44/50 or .45/50 bullets and sabots by bulk will save you plenty.
FWIW, I have not been able to get the accuracy out my T/C Encore(same bbl as the Omega) with full size conicals using various charges as I've been able to get out of sabot rounds. But all rifles are different as I can get very good consistant accuracy out of the full conicals out of my Rem. and CVA. As well as okay accuracy(as in good deer hunting accuracy) out of the Knight.
But the Knight does best with sabot rounds too.
Have fun investigating what your rifle likes the best.