talking the tc hawkins .50 cal flintlock. here is what i like about powerbelts, say 295. i dont like recoil. your shots here in pa. with flintlock will be a max of hundred yards with open sights. thats it. most of the bucks i got were around 60 yards in last 45 years .i use the MAXI-BALL 370 gr. not the MAXI-HUNTERS. why, they are cheaper than the powerbelts .i get 20 for 6 dollars, unlubed.18 dallorsfor 20 powerbelts. BOTH shoot great out of my hawkins. back to subject,you can load up to 100 grs with 2f on the 370 maxi-ball. it will not fall apart. if you load the powerbelts 295up to 100 grs, they will explode. why, no HOLLOW POINT. i LIKE the 295 gr hollow point powerbelt because i can load it lower and i know it will OPEN up.thats great. you can load your flintlock open sights with less powder. i LIKE that because i dont like all that recoil and i shoot better too. recoil can make a lot of us JERK on pulling trigger. you DONT need all that velocity on a 100 yard shots on WHITETAIL DEER with OPEN sights. now, on to in-lines where you may want that extra 50 yards, to 150 with scope, i would shoot bullets over 300 grs and hottest load that would work. you want to get flatest shooting when you have to reach out to 150 yards.so, i would go with 348 powerbelt or 370 maxi-ball . you want heavy bullet with higher velocity.take care.