That really depends on how you set up your 30-30. If you are able to mount a decent optic on it, and if you use the LeverEvolution ammo, then a 30-30 becomes a 200-250 yard gun, even for deer. However, few 30-30's with a tubular mag and barrel band are going to be accurate enough to consistently shoot beyond 200 yards with confidence. So it's not the ballistics but rather the weapon they are chambered in, that usually is the limiting factor.
My personal 30-30 is a pre-64 Winchester that happens to have a superb trigger. With a 4x scout scope, I've routinely shot 1.5" groups at 100 yards and 3-4" groups at 200 using LeverEvolution ammo. Ballistics tables based on my actual chrono'd MV tell me that 160 grainer is still packing over 1K ft. lbs. darn near to 300 yards. I won't take a shot that far with my rifle, but I wouldn't hesitate to take a 200 yard shot at a deer, or even a 300 yard shot at a feral pig.
That gun has accounted for literally hundreds of feral pigs and I have no idea how far the farthest shot I made with it actually was, but if I had to guess, I'd say somewhere in the 250-yard range. And usually they were running full tilt too. LOL