This thread is a little old but I just saw it.
We have had a Flintlock only season in Pa. since the late 70s beginning the day after Xmas and lasting about two weeks.
Its funny but when that season rolls around I kinda forget about all other guns and shooting and really get into shooting my flint locks.
I have two TC Hawkens and two Renegades 50 and 54 cal. I gave my son a 50 Renegade and I have, in addition, a TC New Englander Cap in .54.
They are all 1:48" except I have a 50 Cal GM barrel which is 1:70 twist and surprisingly, although all the same twist, all like something different as far as load, ball, bullet, patch thickness, charge, etc.
Deerslayer, I have found 320, 370 gr Maxis and the Maxi Hunters ridiculously easy to load even in moderately fouled bores in all of these rifles. But I have also found that these projectiles cause excessive leading even with relatively light powder charges. Maxis were even illegal for a time and some contend it was because of the possibility of the maxi sliding off the charge and creating a bore obstruction. I have never seen this happen but all the boys I know that use them generally keep the barrel tilted up and occasionally give the bullet a tap with the ram rod to be sure it is seated on the powder charge.