I shoot TC Hawkens .45, .50, and .54 caliber rifles, with TC .018" prelubed pillow ticking patches in all of them, using Hornady .440, .490, and .530 balls.
I use the same Goex FFFg loads in all calibers...60grns for targets, 90grns for deer hunting...fast, clean and accurate.
If your TC Hawken has a flimsy wooden ramrod, suggest you get another one...the flimsy wood will break and you can seriously hurt yourself. I replace all of mine with solid brass rods...makes the Hawkens look even better, they're strong as all get out, and the extra weight improves accuracy as the barrel just hangs dead still on the tagrget.