Questor, you may want to rethink what you're asking for. Any expansion turns the bullet into a parachute. Pigs are tough. Even a sow without a gristle plate has skin akin to armor plating. Thick and tough. A boar almost defies description when you consider getting a bullet through each side. At pistol velocities you want penetration, penetration, penetration. The most I ever go in the expansion department when pigs are involved is to cast 1/2 ww and 1/2 lead and I keep those loads separate to shoot from my carbine, not the pistol.