I have a Yorktown 54 Caliber Flintlock with a 1-66 twist that I’ve killed many deer with for over 35 years with 80gr. FFFg & PRB. For target at 50 yards I use 60gr. FFFg POA and 100 yards I use the hunting load for POA
I’m a new member here and I’ve been shooting 54 & 36 caliber flintlocks for 40 plus years. Mainly nowadays a 1990 Yorktown 54 caliber & a 1987 J. garner 36 caliber