You have to follow your dreams and I like your honesty. But if you ever felt the urge to save money, I would encourage you to use your 5.56 (.223?) for hunting hogs. You just have to know its limitations and work within them. Chances are you will already have a 'feel' for your 5.56, and I believe we are more inclined to do better shooting.... and are more able to work quickly.... with a gun that is familiar to us.
Not that I would recommend it, but I've shot a number of pigs with a .22 rimfire using subsonic ammo and a silencer. However these were mostly fairly small hogs, and I had to wait to get a steady shot at the vitals. (I am inclined now to go for a heart lung shot rather than go for the elusive, skull-protected, brain box unless I am really close and at a good angle). Lots of people use .223s for pigs and deer, and my father shot a lot of big animals with his Krico .222 Remington.
With a really big hog, it may not be appropriate to take a side-on shoulder shot with a light high-speed bullet which might completely lose its 'oompf' on the tough protective shield skin and shoulder bones. But I'm convinced you could still get some good pork with the modest 5.56 .... And I think that some of the best pork running around the countryside is likely to be packaged in the smaller hogs that the .223 could easily deal with.
But it would be good to own a Winchester 70 with such a versatile cartridge. And certainly a good hit with this rifle would be more likely to have a swift result than anything smaller. However bullet placement is more important than raw horsepower. It shouldn't take long to become confident with the new smoke stick if you've already done a bit of shooting with other weapons.
I don't know how things work in your country. But I'd be doing my best to meet a farmer (rancher?) who has a hog problem and who would be open to allowing a sensible hunter on to his/her land. And if there were no hogs nearby, I'd probably put that wish on the backburner and hunt edible species of another sort closer to home. But like I said earlier, aint nothing more important than to pay attention to your own dreams.
Funnily enough, I'd love to go squirrel hunting. I've shot deer, pigs, goats etc.... but I'd just love to get out in your country with a .22 and get a feed of squirrels.
Best of luck with the adventure. I hope to read about it some time.
When I was very young, a buddy and I went for a walk into game country. He was a keen photographer, and I took along my Anschutz .22 rimfire. My buddy managed to take this picture when a mean-looking sow came out of the scrub. It took more than one shot, but we got the pork. It was a great occasion, but it was some of the foulest meat that I've ever had in my mouth.
This wasnt a world record animal, but it was an excellent bit of pork. Taken with an old Browning semi-auto rimfire fitted with a moderator:
And this pig didn't even cost the price of a cartridge. I caught this in a snare I twisted from some synthetic rope fiber. The satisfaction of having caught this hog in a home-made snare is far greater to me than the thought of shooting anything:
Best wishes .... Coote.