Over the years we've developed loads for enough different guns, calibres and styles to achieve an understanding of what will most likely work in most any other rifle. It actually works as to patch and ball size.
.020" to .023" patch - odd time a gun will need12 ounce denim which I measure at .025 in my mic and .030" with calipers.
Suffice to say, that with most any gun, a ball that is .005" smaller than the bore, with a 10 ounce denim patch, will shoot well, with a water based lube: GOEX powder used in these.
I do not like using 3F in the above .50's as I find 2f is more accurate and develops LESS pressure at any velocity. Meaning 1,700fps with 2f develops LESS pressure than 1,700fps with 3F.
35gr. 3F in a .32
45gr. 3F in a .36
60gr. 3F in a .40
65-70gr. 3F in a .45
85gr. 2F in a .50
85-100gr. 2F in a .54
100gr. 2f in a .58
115gr. 2F in a 62
125gr. of 2F in a .69
With oiled patches, these loads usually have to be increased to give the same accuracy and point of impact.
However, some people cannot stand to have this much fun with the larger bores and that's fine, too. The larger calibres (.54 and over) are usually not as finicky or picky as to load as-are the smaller calibres, and will usually shoot decently out to 10yards with lighter loads. The best accuracy in any particular rifle of course, is something you must find for yourself.