I have hunted elk with a round ball and I am a die-hard flintier as well.
At close range 50 to 75 yard with my 54, a round ball dose nice work on big mule and smaller cows and spikes. At the out limits you don’t get complete penetration but they do leave a good hole. I just wasn’t real comfortable about it though so I started molding my own maxis a couple years back and have since went to those for elk but have stayed with the RB for deer.
I to clean much as you stated .
i use 3F in barrel and 4F in the pan and black powder only