Like someone else said - lots of ideas on this subject...
Forget the .223 (mini-14) - too small for hogs. For hogs, simply put, "bigger is better." .30 cal is the minimum I consider for them, but "@ range?" While yes, you can certainly kill a hog with even a small caliber round, it is far more dangerous due the increased criticality of shot placement. Yes, you can put down a hog in a trap with a .22 shot behind the ear, but when it comes to knocking one down in the field, more energy & penetration along with increased caliber rule the day. I'll admit, I took out a small sow (~175 lbs) @ 140 yards using a SKS using plain ‘ol FMJ Chinese (Norinco) ammo with an open sights "pot shot." (1 shot to dispatch.) Would that have been my first choice? Absolutely not - but it's what I had with me at the time.
The .30-30 outpaces the energy of the 7.62x39 at the muzzle, but since the 7.62x39 has a spire point instead of a round nose like the .30-30, it retains it velocity better (i.e. better ballistic coefficient). If you simply “must” consider a Ruger in semi-auto, consider the Mini-30 - it would be a much better choice considering hogs are on your “hit list.” (As someone else mentioned, SKS’s, AK’s etc have a larger bore than the domestic Rugers - so while it is possible to shoot domestic .308" diameter bullets in a SKS/AK, you are going to run in to increased pressures if you shoot foreign produced .311" bulleted ammo in the Ruger.)
Now, considering the “long range” issue, neither the .30-30 or the 7.62x39 are considered “long range” rounds. For true long range shots, you want accuracy and energy - neither of which are considered strong suits with either of those cartridges. If long range shots at thin skinned critters in the coyote/dog class were your only issue, there are ton’s of rounds you could consider (e.g. .220 swift, 6mm Rem., .243, 6mm/284, .257 Roberts, .25-06, .264 Win Mag., etc... (a ton left out) - but with the hog aspect, you are adding a fly to the ointment.
First, if “long range” is truly your wish, I’d go with a bolt action instead of lever or semi-auto. Traditionally speaking, bolt action rifles are the most accurate type of action made. Second, I’d pick a cartridge that is (1) at least .30 caliber (hog), is (2) has a high velocity (say 3000-3500 fps @ the muzzle for flat shooting), and (3) is “known” for it’s accuracy.
To me, the two most common cartridges (assuming you want to stay away from wildcats or other “exotics” that fit this bill would be the .308 (7.62 NATO) or the .300 Win Mag (big difference in velocities/energies, but both meet the criteria I mentioned above including common use in competition.) There are a lot of new cartridges out there too that you could consider that should fit the bill nicely (say the .300 WSM or .300 SA UM) - neither of which I have direct experience with, but seem to be getting favorable reviews.
Recoil/energies are radically different between these cartridges - so that’s something that you’d need to consider as well (you need to define in yards how far is “reach out and touch” is.) Additionally, if you really want something in a semi-auto, there are multiple options when it comes to getting a .308 in SA. (Don’t know of any in .300 WM).
Unfortunately based on your description of what you intend to shoot and at the “how” (i.e. increased range), I think you’d be disappointed overall if you went with either the .30-30 or Mini-14. Don’t get me wrong - great guns - just not well suited for the uses you describe.
