in my t/c hawkins .50 cal flintlock 1-48 twist the best bullet for me is POWERBELT.
why.because i can load DOWN not up and know this bullet will open up.this is GREAT.i get less flinching, less smoke,less kick, less noise,loads easy,very accurate.this all makes me a better shot.
using the 245 is bad thing.295 i like and use most but the best one is the 348 because its length/weight is very close to the best bullet for t/c ,370 maxi-ball.i use 70/80 grs of 2 or 3 f.80 grs of 2f was my load but i am now using 3f........

in a in-line at fast speeds i would not ever use a powerbelt.....unless it was the heaviest one or one with new platinum tips.......