That sounds like a healthy load you have there. What was the bullet performance like - obviously good since it killed the pig first shot, but how far did it travel internally and how well did it mushroom?
I hope to do some pig hunting down here in a couple of weeks time (weather permitting - many parts of the state have, or are currently being, flooded, and more rain to come over Christmas) and I've loaded up some 500gn hard cast in my 458WM at about 1600fps. This is about the same muzzle energy as a 308Win so it shouldn't lack the power and the large bore projectile will certainly leave a decent wound channel at the very least. I'm just not sure whether the hard cast will mushroom enough to be effective. I haven't been able to find the fired projectiles at the range to check for mushrooming.
I'm taking some full house reloads using 325gn Hornady FTX and 400gn Woodleigh PPs, just in case the lead doesn't perform well enough. Of course that's assuming I find pigs to shoot in the first place.