I had a .50 caliber flintlock which I think had a Long Hammock barrel, 42" x 7/8". I did not spend a lot of time on load development and my vision has deteriorated with age. I was using it mainly for recreational shooting... I am not a serious competitor and my hunting days are pretty much behind me. Anyway, I shot .480" Hornaday swaged lead balls with .018" patches of pocket drill with Dixie "Old Zip" patch lube or pre-lubed .018" drill with Wonder Lube. I used 55 grains of Goex or Swiss FFg ("two F"). I normally used a 6" ball starter, followed by the ramrod. The ball starter was probably not necessary, but I had one, so I used it.
Accuracy, by any normal person's reckoning, was dismal, but I had fun with it, and it loaded easily.
Shooting in the very relaxed local matches, I would usually swab the bore with one wet patch followed by a dry one between five-shot relays, just because, but I probably didn't need to. I usually had plenty of time. Most of the other guys had very elaborate loading procedures, and a couple of them required and used mallets to drive their balls all the way down to the powder. Every one of them routinely shot better than I did. I didn't let it worry me. My recovered patches looked OK, with no cutting or burning.
Serious shooters will almost all tell you a tight fitting ball and patch combination is essential for accuracy. I won't argue with that. Different shooters have different opinions on what constitutes easy loading versus hard loading. The .480" ball will shoot in your .50 caliber rifle, but it's up to you to determine if accuracy is good enough or not. You set your own standards. Or at least I do. Having fun is my primary objective. Life itself is such a freakin' battle sometimes that the last thing I want to do is fight with my rifle over a tight ball.
If you order Hornady .480" balls, make sure you get the pure lead ones. I'm pretty sure Hornady also makes .480 hard balls that come with little plastic cups like sabots. Another option is to order the .487" pure lead round balls by the Missouri Bullet Company, and sold by Graf's. I bought some but haven't tried them yet. These ought to load a little bit easier than the .490" balls, although not as easily as the .480's. You would probably gain a little accuracy over the smaller balls though.
Captain Dillin said in The Kentucky Rifle that the old time hunters often kept two sizes of balls in their pouches, one size for best accuracy and one for a quick reload. This has been brought up before and a lot of today's shooters poo-poo the idea, citing the difficulty of keeping the two sizes separate and organized. They have a point, but so did Dillin. Where there's a will, there's a way, and if you want to carry two sizes of balls and your dinner (or scalp) might depend on keeping them separate, you'll figure out a way to do it.
It's always good to ask for and consider opinions. That was mine. Ultimately, you follow your own path.
Be safe, and enjoy the trek.
Notchy Bob