Dunno if it's true for all Big Boars, but certainly so for both of mine. And something you may really like:
Both of mine are really "forgiving" about powder charges. It seems like no matter where you go up and down the charge scale, they always shoot well. I'm just not smart enough with the ruler to measure consistent differences in group size from one charge to the next. They shoot as well with 40 grains of 3f, 80 grains of either 2f or 3f and 120 grains of 2f, my preferred loads for different uses. I could just as well use loads 10 grains on either side of those without any change in results. Guys who have been fooled into believing 1:48 twists are some kind of "compromise" have never gotten acquainted with the Big Boar.
BTW- I still can't promise the same for yours, but both of mine are in love with .570 balls, ticking and TOW's mink tallow. They seem to be pretty democratic about conicals too, with all I've tried shooting really well so long as there's a greased wad under them. I don't really see the need for them in my hunting, but if you want them for your pigs there's reason to be happy.