Hogs... I've shot em, stabbed, arrowed them, drowned them, even killed one with a post once, i've taken them alive and tied them... In the last 17yrs i've placed a few semi-truckloads of them in the KIA column.
You can kill em with about anything most of the time... I shot one 80lb sow through both shoulders with a 405gr softpoint out of a 45/70 and watched her run about 75yds before dying. I launched a 300gr XTP into a 100lb sow at 2300fps out of the same gun and watched her run off like it never hurt. I liver shot one a month agothat weighed 150lbs dressed with an AR-15 and some 64gr PMC ammo and it dropped in 20yds. I piled 17 up in about 2 minutes one day on a sendero when the dogs pushed em to me all with an AK and 122gr Barnual HP ammo. Will the 7.62x39 work, yep... Is it my choice? Nope...
Hogs are tough critters, alot of times these "misses" folks claim are actually hits that didn't bleed and they saw no reaction from the shot. Hog shoulders don't shatter like deer shoulders do. You can wizz bullets right through em and they will just run off sometimes, other times they drop like you hit em with a 20mm canon.
As to charges,
Lets just say the more a guide talks about people being charged the more hunts he books... Does it happen? Sometimes... Not very often... I've probably shot more of the things than most folks here because of opportunities i've had to hunt certain areas. 17yrs and in that time i've had two hogs I thought tried to get me and both of them where crippled, most try to get away, some may stand and grunt or huff, pop their teeth, but try to get you, not very often. So I say take that consideration out of the equation...
So you have a critter who will weigh anywhere from 5-400lbs, who has very thick hide, has vitals protected by that hide and bones, whose ability to not leave a good blood trail is unrivaled, but won't try to come and eat you very often, normally just runs away.
So if you are going out to shoot one hog(we shoot them in batches), then you need a rifle that delivers one shot that will not only hit the vitals but blow through and leave an exit. A 7.62x39 will not do it on hogs over 150lbs if you hit a shoulder. Oh and the vitals, they lay between the shoulders... Not behind them like part of a deers lungs do... I used to own a Turk and shot the S&B load and liked it on hogs.
Remember the lungs are small and mainly between the shoulders. The heart lays low in the chest(almost at the belly level) just about directly between the shoulders and right in line with the legs. I'll attach a hastily done paintshop pic to this for you.