I don't know about the Contender, but many hunters in Texas use the .30-30 lever-action on hogs. In Texas, the hogs usually come to the corn feeders, so hunters can set up pretty darn close - sometimes as close as 15 yards or so. In any event, GB is right, if you place the bullet in the right spot, then the .30-30, even in the contender, should be fine, especially as distances shorter than, say, 75 yards.
Zachary