Quoting a concern - "where you could get raking and texas heart shots"
It does not take a cannon to kill a pig with a Texas heart shot ( my son does it easily with his .223 ) . The bullet and shot placement are very important- IMHO, more than caliber.
"If you shoot one in the eye, it is gonna die"
It may be that one reason we see so many Express cartridge and big bore rifles recommended for hogs, is that hunters like to shoot those rifles. I also have and do use 45-70, 45-90 (.458 2.4), 405WCF, in addition to smaller "deer rifle" calibers, including .357 Magnum. I KNOW GUYS THAT USE ONLY AR 15 .223 RIFLES with good success.
However, it seems that suggesting that a big bore or Express rifle is needed to kill hogs is wrong and wrong headed.
JHT,
My congratulations to you and your daughter for that good shot on the hog. Reminds me of the wife of a Colorado outfitter - her elk rifle is a .243 and her answer as to where to shoot a big elk was "right behind the ear".
My daughter is also deadly with her .243 and her 7mm Wby magnum. She, my son, and I are headed out for some feral pigs as soon as the range dries up from recent rains .