I'd opt for the added weight like Quick suggested before using a muzzlebrake. ...that is if your shoulder can handle the additional weight.
You probably know that the muzzlebrake tend to create alot of blast and noise. With hotter handloads, it'd be even more.
You may not need any "special loads" for pigs, the non-cowboy ammo from the manufacturers should be plenty for piggies. 300gr JHP, 350gr JHP and 405gr SP are available on the market ranging from 2000ft lb to 3200 ft lb of energy-available from Winchester, Remington and PMC.
I personally wouldn't be afraid to use the Winchester 300gr JHP's on them. They shoot great with very moderate recoil. ..my only grief with them is alot of unburnt powder, or what seems to be with me.
I've hunted pigs in FL with .357mag handguns and 30-30 rifles. Both were quite capable stoppers, the factory load 45-70 being even a greater stopper should have no problems.