I have a Marlin 336CS (~1995 YOM) Blued with standard loop on the lever.
I bought it 2nd-hand in 1999, and it came with a Williams Peep sight on it. I nailed a lot of pork with it over the years since, though the Williams has been replaced with a C-Moore Railway red-dot sight.
[Not sure if I mightnt go back to the Williams; the C-Moore isnt as easy to use as I hoped]
If you arent loading up your own ammo, the very best .30-30 ammo I've found for Hot Pork, is the Winchester 150Gn Hollowpoints. They dont deform in the mag like most other .30-30 projectiles, but they hit REALLY hard, and create a lot of chaos.
Still havent been able to track down who makes the projectiles, or where one might buy them for rolling my own, but Gees; they work a treat!
I've used a lot of the factory Hornady 160Gn FTX loads, and also loaded up quite a few as well, and it's funny; even though they fly a lot flatter than the standard 150gn bricks, I find them hard to figure out. I think it's to do with the expectation that .30-30 rounds will fly like bricks, and so when you get one that has some semblance of a ballistic arc to it's flight, you dont know where the heck it's going to land. They grouped pretty well when my brother and I tested them out, but we both found that the second you have a live target, all your hard-learned knowledge as to how much holover etc to give, is all screwed up.
I've also loaded up a set of the Barnes all-copper 150Gn HP rounds; freaking great big eggcups! Sadly, only tested them close-range on a few grasshoppers, and they were pretty brutal. The rest are still waiting for a chance at smoking bacon.
As an experiment, I did also load up a set of 20 Speer 130Gn HP projectiles, with a LOT of reminder stickers on the box to the effect that they can only be used single-shot only. Something to run over the chrono some time, just to see how they go...
A great Hot-Pork-Negotiation tool, is the 336....