You didn't say what caliber?
The best group I've ever gotten out of my .54 cal Renegade is with 75 grains of 2f, a .530 ball (Speer) and some TC .015" store bought patches with Natural lube 1000 plus. Most will say to avoid the store bought lubed patches, as you have no idea how long they've been on the shelf and a lubed patch breaks down over a period of time, but mine just loves the darn things. 1" group at 50 yards if I do my part every shot.
The next best groups I get with a hunting type patch lube is the same load as above but with .018" patches lubed with either straight olive oil or with a 5:1 ratio of Denatured Alcohol and Castor oil. If interested in the latter lube, you mix 1 part Castor oil to 5 parts denatured alcohol and then shake the heck out of it. Dip patches in it and then set them on some wax paper. The alcohol will evaporate and just leave a film of Castor oil. I get about 2-1/2" groups out of this at 50 yards. The ratio can be played with to improve groups, best ratio is usually reported to be in the 6:1 to 8:1 neighborhood. I tried 8:1 and on a fouled barrel it was a nightmare to load without swabbing the barrel for even a second follow up shot. So I then tried 5:1 which loads much better. Haven't tried any other ratio yet.