Yes that's a correct assesment in most-all fast twists.
You bought a sabot gun there. Why not try them first? Being that your gun and twist are sabot bullet-friendly, pick out a grain size you want from those offered in packages from T/C, Traditions, Buffalo and CVA for best fit in your new T/C. The bullet offerings from Barnes, Knight and Hornady seem to be a tighter fit in most cases. Buying those may require purchasing an aftermarket, easy-loading plastic sabot from makers like Harvester. A friendly first choice in powders would be either Pyrodex, 777 and Goex real blackpowder.