I talk to first time gun buyers all the time about this, the calibre for pigs and or deer. Most of the time the .30-06 comes up and the rest of the time they either want a 300WSM or a .338WM. In all reality you don't need that much 'gun' for pigs and deer in Aust, exempting all but the biggest Sambar. I always recommend the .308WIN because it is hell easy to get ammo for, cheap, an abundance of rifles made chambered for it, accurate, basic to reload and overall almost as good as the .30-06 with it lagging only a couple hundred ft-lb's and fps behind when using 150-180gr projectiles. But, without the extra recoil, noise and expense.
If you wanna shoot pigs from long range, then the .338 is the go, but for scrub work you will find the recoil and muzzle blast to be uncomfortable when firing multiple shots.
The biggest boar I have ever seen was shot by a mate and his .243WIN and it went down just as quick as the 80kg one I shot with my 458WM (I was after buff!).
Get the rifle you shoot the best that can do the job, not the one with the coolest chambering! My $0.02!

Have a good one!