i know alot of ppl who like to use the marlin 30-30. me personally wont hunt a hog without a bow in my hand and a pistol on my hip lol ive seen ppl use anything from 22 lr. (which i HIGHLY do not reccomend) to a 338 federal. for rifle caliber i would try 25-06, 300 win mag, 30-06, 270, 7 mag just whatever suits you bud.