I promise you.. 223 55 grain vmaxs are wonderful on pigs. killed dozens of them with a Ar15 using that bullet. some of them, not so great shots either. The furthest I recall was a small 40 pounder at 300 yards. I shot him in the butt. Found him right there.
I don't use fragile type bullets for two reasons, not because they don't work, though.
The primary reason I don't use them is that they tend to ruin too much meat. The bullet blowing apart inside of an animal causes a lot of blood shot meat that's hard to clean up, and causes some that can't be cleaned up.
The 2nd reason is that I tend to use the same bullets for most of my hunting. I find a good load, using a decent bullet, and use it. Fragile bullets can sometimes fail to penetrate deep enough for a quick death on larger and/or thick skinned animals. For an example, I use a 7mm mag for most of my hunting. My load is a 145 grain BTSP at near max load. I use it for our little coues deer (100 lbs perhaps), and for buffalo (1000 lbs+), as well as most things in between. They all die very quickly after being shot through the chest with that load, and it doesn't ruin much meat. The same load with a more fragile bullet would likely blow a coues deer nearly in half, yet might not penetrate a buffalo well enough for a quick, clean kill.
For the first 15 years of my hunting adventures, I used Sierra Bullets (mostly without exception). They were pretty fragile, put big holes in animals, and killed them very dead. I can't remember ever losing an animal while using them.
Then, I decided to try some others when a 175 grain Sierra Game King bullet failed to exit a broadside coues deer. It make me a little nervous, because I intended that load for elk.
I finally settled on Speer (and haven't lost an animal with them, either), and I like both the BTSP's and Grand Slam bullets. They work, and don't ruin all that much meat.
A few years back, I went antelope hunting with a buddy. He was using a .308 Win with ~165 or 168 grain Sierra Bullets. I was using my 7mm Rem Mag, with 145 gr Speer bullets. He took a shot (facing him) at ~250 yards, and lost nearly half of the meat from his antelope. I took a broadside at ~210 yards, and might have lost 4 ounces. His buck died in it's tracks, mine died after running a few steps.
And that's just about typical of what I've seen for years. Either bullet will kill quickly and humanely as long as it enters and/or passes through the vitals, causing sufficient damage. Like mentioined above by the quoted poster, I've even made bad shots and had them drop on the spot; it's just a matter of how much meat is damages in the process. There's no guarantee either way, but the tendancies I've seen lean toward less meat damage from better constructed bullets, as long as they're not constructed so well that they won't expand and thereby don't do enough damage to kill quickly.
Daryl