Nice rifle! I haven’t seen many CVA Kentucky rifles. Great rifle at a really great price. Your most accurate load is probably going to be in the neighborhood of 70gr. Start at 50gr and work up shooting 5 shot groups. Some do 3 shots, but 5 gives room for shooter error and flyers. You may find that you need to go to an .018” patch. The .010” probably won’t be that great with a .440 ball. Do you know the twist rate of your rifle? The above 70gr accuracy load would be true for a 1:48. There is a good chance that your Kentucky rifle has a 1:66 twist. This would be great. You can push some pretty heavy loads through the slow twist and still obtain great accuracy. If you need an explanation for how to check the twist rate, I’d be happy to help. A lot of times you will find 2 accurate loads at different nodes - meaning one powder charge somewhere between 30-50 grains and another between 70 -100. CVA recomended 75gr 3f for best accuracy based on their test rifles. I couldn’t find a max from CVA but did find a max load given by Sam Fadala at 120gr 3f. I think this is extremely high for a 45 and wouldn’t recomend it. Watch for pressure signs as you work up. I think you’ll find a sweet spot before you hit 90gr. Again, it depends on your twist rate.
Since you requested guidance and reading materials, I’m assuming this is your first muzzleloader. Do not be in a hurry. Make absolutely certain that your PRB is seated firmly on the powder. No air gaps allowed with black powder, unless your goal is to make a pipe bomb. Powder - patch-ball. Repeat this to yourself until it becomes second nature. It’s not much fun pulling balls because you forgot to add powder, and it’s really not safe if you accident double charge. Take your time and enjoy the learning experience. 3f black powder is what you want for this rifle. Pyrodex RX is equivalent to 2F. Pyrodex is also highly corrosive and I personally would not recommend it for that rifle. Some guys use it and swear by it. I’ve seen some really nice rifles get trashed from its use but that also usually included poor maintenance and cleaning. Use it if that’s what you can get, but use Pyrodex P (P stand for Pistol as is the FFFg equivalent) and get it cleaned right away with hot water and a couple drops of dawn dish soap- then clean with hot water, dry patch until all water is removed, some guys will also run an alcohol patch for extra measure, then a patch lightly coated with a good gun oil/rust preventative. If you can find some real black powder, that would work best for you. Triple 7 burns cleaner than pyrodex and is not near as corrosive. No matter what you use, you will need to clean it when you get home. Black powder is hydroscopic so you don’t want that sitting in your barrel for extended periods. Remember that Black powder, and it’s substitutes are measured by volume, so you need a good volumetric powder measure.
Welcome to the forum and welcome to black powder muzzleloaders. Folks here are extremely helpful, so ask as many questions as you have. The only dumb question is the one you don’t ask.