Hey Mike, I am no hog expert, but I know of at least one with vast knowledge of pighunting. Maybe he'll chime in.
That said, I am wondering what type of boar are roaming Texas these days? I am guessing feral hogs.
Where I used to hunt around Hooper's Bald in the mountains of NC, they were all Prussian boar imported in the late 1800's from Germany by Vanderbilt. Those things were tanks, with a lot of gristle plate along the flanks. Up to 450 pounds or so, and not fat at all. I would not want to shoot one of those with a .40. If you take a .40, I'd carry a large bore sidearm for insurance. Where I hunted the guides insisted you carry a sidearm, as "You cannot shoot a pig with a rifle while hanging from a tree limb." Apparently one guy was cornered all night up a tree by a persistent hog. He had no sidearm to use on the hog.
I am sure a .40 will work on a smaller feral hog that isn't agitated.....with good shot placement.
Just my 2 cents worth, and I am far from any expert, that is for sure. God Bless, Marc