Crawling around in the 'glades looking for big pigs I'd go for a short barreled levergun, 44 mag, 45 Colt, 444, all with 300+ grain cast bullets, or 45-70 with light(er) cast slugs.
Bolt action rifle I would look for a carbine chambered in 338 Fed or 358 Win or my current personal fast action turnbolt favorite, the Ruger GSR in .308. As others have pointed out, a well constructed 165 gr .308 will make short work of any hawg that has ever walked the earth.
I never stop being amused by the flames emitted in the 338-06 vs 35 Whelen wars. WTH? Does anyone seriously think there is a gnat's ass difference between the two? One shoots a tiny bit flatter, the other packs a tiny larger whallop, and THAT, as they say, is the end of the story. Pick the one that tickles your fancy. They are both effectively a reloader's cartridge and in today's crazy political climate, if you don't have reloading components and or ammo stockpiles to keep shooting for the next ten years you're an idiot.
Am I wrong? How often does Hornady, Federal, Rem, big Red et. al. do ammo runs of 338 Fed, or 358 Win, or 338-06, or 35 Whelen? How often does Sierra, or Speer, or Hornady do bullet runs of anything these days besides .223 and .308 caliber bullets? Seriously, after the shooting in California two weeks ago, I got online and dropped another $1000 for reloading supplies. I will not get caught again like we all did after Newtown.
Now for my plug, I'm a 35 whore, 35 Remmys, 358 Wins, and 35 Whelens all sit in my gun safes. My custom 03a3 Whelen AI spits out 225 Partitions at 2825 fps with 60 grains of powder and puts those bullets on top one another at 300 yards. I've killed a lot of elk in my life, 25.06's, 243 Win's, 308's 06's, 270's, 35 Remington's, etc. but I have never had anything drop an elk like a Whelen. And besides, c'mon, it was invented by the first Colonel, not to take anything away from the 2nd Colonel.