I have a 5.56 AR, a Remington 7600 .308 ( I really would rather leave this one alone though it's my baby), a Mossberg 30.06 (same story as the Remington though I'd like to leave it be), a .22lr ( I know it's far from ideal but it's a damn accurate rifle and I don't have giant 400lb pigs, just 125+/- eaters.
So basically, you are down to a .22lr and .223 as your only options. The other rifles you mentioned are just noise not relevant to discussion here because you aren't willing to use them.
DO NOT USE THE .22 LR. Why? Really simple. You won't just make ear shots. Instead of a 125 lb eater, you are going to have a 250 lb boar show up and chances are you won't let it walk, not unless you have amazing willpower and restraint. You will come up with a dozen instant rationalizations as to why you should shoot it. If the first shot doesn't drop it, you will try to pepper it as it runs away. I don't know you but I have hunted with a LOT of people and the lack of self control I have seen that comes with buck fever or blood lust is for too overwhelming for some many people and they will use whatever they have in hopes of bringing down a hog, whether it is too much or too little for the job and the .22 lr, even an accurate one, is too little for an inexperienced hunter to be using. Yes, it will kill hogs. A pellet gun will kill hogs. The reason why people don't typically use pellet guns or .22 lr on hogs is that just about everything else is a better option.
Let me put it this way. Let's say you are only going to make ear shots with a .22 lr. Cool. How far are you shooting? Let's say you limit yourself to 50 yards. A CCI Stinger 32 gr leaving your barrel at a whopping 1640 fps will take 1/10th of a second to get there. Add to that the 0.20s it took you to decide to pull the trigger and you are looking for up to 1/10 of a second from the time that you decide to pull the trigger until the bullet arrives. How far can the hog move its head in that time? Pretty far, 1-2" would not be unreasonable to suggest, right. Now you have a .22 lr bullet leaving the muzzle with 191 ft lbs of energy, impacting with about 116 ft lbs, potentially in the wrong place. Maybe you are using a big Winchester XT22lr 40 gr. bullet leaving your muzzle at 1150 fps with 0.14 second of flight time and hitting with 98 ft lbs of energy. That doesn't sound too good either.
Even if they do hit the ear, the ear hog extends out of the farthest rearward portion of the skull. A tad too far back or the wrong angle and you miss the skull all together and now you are relying a permanent wound cavity and direct tissue crushing in neck muscle to put down the hog. You aren't going to be getting a larger-sized permanent wound channel. You won't be getting hydrostatic shock and hydraulic shock will be minimal. Not good. You would have been better off aiming at the mid point between the eye and the ear such that your shot had the best chance of going directly into the brain. Even then, you still have to deal with time of flight and how far the head may move.
Have you taken a look at Flintknapper's Feral Hogs in East Texas thread? You really should read it. It will take you a couple of days.
So you are left with .223. I HAVE hunted hogs with .223 and killed a bunch with .223. With .223, you will get penetration that you won't get with .22 lr. You will have a bullet of greater weight traveling at 2-3 times the velocity of the .22 lr. Unless you pick a non-expanding stable bullet that doesn't tumble on impact and pencils right through, you are going to have a larger and longer permanent would channel. If it pencils through, just longer. Maybe you use 55 gr. XM193 that will tumble and fragment. I have used them and they work. Maybe you will use some expanding ammo, maybe even one of the pricey Barnes all copper offerings. They will expand and quite likely drill a permanent hole all the way through the hog, not huge, but penetration will tend to be pretty good.
Let's say you find some of the suggested Winchester Razor XT noted above. With a muzzle velocity of 3020 fps, you will impact at 50 yards in 0.05 seconds with 1135 ft lbs of energy from a bullet traveling 2826 fps. That is substantially more than you would get from your .22 lr. At 100 yards, which you should not try with your .22 lr, your bullet would still be traveling at over 2640 fps and have over 990 ft lbs of energy and get there in .11 seconds.
Most people who regularly hunt hogs will not use a .223 unless they have no other option, the most common I hear being that they are predator hunting and happen to have a hog show up. They do want something more powerful, that will do more damage to the hog, creating bigger wounds, better bleeding wounds, etc. Now, I know that there are plenty of folks that hunt hogs with .223. I am not saying that they should not or that they are somehow wrong for doing so, only that they are not in the majority. The point is, when you go with smaller and less powerful calibers, you tend to need to be that much more precise in your shooting. A 1/2" off with a .223 expanding round may not matter, but 1/2" off with a .22 lr may mean the difference between dropping your hog on the spot and the hog running away screaming into the woods. Similarly, an inch of with a .308 expanding round may not matter. Bigger and more powerful calibers tend to do more and more damage, all other factors being equal. That isn't an excuse for not shooting well, but a matter of giving you more leeway when reality sets in and the hog isn't perfectly stationary, the wind isn't perfectly calm, and your adrenaline dumped, making it difficult for taking that precise shot you have planned on making while you were waiting on hogs to appear.