People talk about velocities, nothing matches the velocity of a small part with a spring behind it!
Folks don't understand why I build benches with smooth plywood tops, painted white most times, and 3 side 'backstops' around the bench... At least I know which way that small part took off when it ricochets!
All cracks filled. No matter how small the crack, there will eventually be a part smaller! (Murphy's Law)
I usually do full tear down cleaning since I don't know how long it's going to be in the gun safe before it gets shot again, and I'm OCD...
I have a hard time not doing full teardown even when I know I'm shooting again the next day... (It's a curse)
One of my favorite lever shooters is an 1894 Marlin.
It doesn't like round ball ammo, which I've become fond of lately.
Not sure any of the levers will like round ball ammo, but I'm having a ton of fun with it in the cowboy pistols!
I hog hunted with 300 grain Hornady XTPs, liked the bullet but kicked like a mule in .44 Mag with +P loads. Actually stretched Ruger pistol frame, but did wonders on hogs.
With many years of stupidity, I've learned most times the lighter loads are not only accurate, but they do just as good a job on most critters, and paper can't tell the difference between a round ball or 300 grain XTP.
The only thing I don't like about cast bullets is cleaning lead... (Does anyone?...)
Micro groove barrels plug up quickly, so when 1894 Marlin was the only common side eject lever gun (hate brass in my face) I got away from cast bullets... Just coming back around to it again.
Anyway, sounds like you have a pretty good grip on things, so good luck and let us know how you progress!