Congratulations on the hog.
Not sure what you are shooting, but I had issues with Powerbelt bullet expansion. More than one bullet passed though a whitetail resulting in less than acceptable blood trail.
I switched to 250 grain T/C Shockwave and 100 grains of Blackhorn. Much better results than the Powerbelts. I shot a small buck last year with the T/C and no exit. He was quartering towards me. And, I was in a tree. Shot penetrated top of front shoulder towards rear quarter without exit. Blood trail was non-existent. Body search in the dark ensued. I found him about 50 yards away. He hopped a fairly tall fence between the scene of the crime and his resting spot. Wow, deer are amazing. Even though no exit, I am happy with the Shockwave. Have shot half dozen deer with it. All piled up in short fashion. I do not bother with bullet recovery. So, cannot comment on weight retention.