If by pests you mean those wannabe whitetails there in East Texas, Winchester 64 grain power soft point did the trick for me when I was living in Austin area.
By feral pigs you mean the big ones or the javalina?
I don't think anything less than a .30/06 will stop the big bastards when they are worked up and running.
A 55 grain softpoint will more than do for javalina
I have used 50 grain hollowpoint, 52 grain hollowpoint, 52 grain Match Hollowpoint, 55 grain power softpoint, 55 grain full metal jacket, 62 grain full metal jacket, and 64 grain power soft point ammunition on coyote and fox here in Illinois and they all work pretty much the same out to 300 meters.
Bullet hits critter, critter goes no more than fifty meters and dies.HTH