If I had a good .357 revolver, I'd roll a .357 levergun (I have a .45 Colt, ergo, I have a .45 Colt levergun, but there's no reason a man couldn't have both guns in both calibers

).
I really do like my Henry Big Boy Steel Carbine. EGW makes a rail for it that makes scope or red dot optic mounting easy (I've got an old Leupy M8 2.5 on mine, in weaver lows). The only drawback to the Henry, is that, while not burdensome, they are heavy (they do come standard with swivel studs). Not necessarily with a heavy loaded .45 Colt or .44 Mag, but probably heavier than a .357 needs to be. They do have a very nice recoil pad, so they don't slide out of a corner and into the floor (like a plastic or steel buttplate will) and it is VERY comfortable to shoot, even with 286 grains at close to 1500fps (admittedly, the rifle hates that load, so right now I'm running the same bullet at 1,184fps with 9 grains of Universal until I find a better "heavy" load).
If I wanted lighter, I'd likely look at a Rossi '92. Slick it up and add a peep sight.
Not a thing wrong with the '73. I think I've even seen some newer ones chambered in higher pressure calibers.
If I were specing out a .223 for your scenario, I'd go short, DBM, bolt gun instead of levergun, but that's just me. I do have a friend with a BLR in .223 and it's sent several groundhogs and coyotes to their reward.
The main thing to me is, if you don't handload, find out what the rifle/pistol combo likes and just buy a case or two of it. I have buddies with a "main" rifle or sidearm, that always seem to be scouring wally world or the interweb for whatever's left 3 days before deer season.