If you plan to take a body shot, I recommend using a conical bullet- your choice of size, and weight. Bullets simply deliver more energy to those tought Boar bodies.
If you want to use a RB gun, then limit yourself to taking head shots( through the ears)!
I learned this lesson the hard way- first boar I shot with my .50 cal. RB rifle. Had to shoot it again. Another friend shot his at well under 10 yards, with his .54 RB gun. Had to use a second shot to kill it. Another friend shot his with a .75 caliber RB out of his Brown Bess. Had to take a second shot to kill it.
We were all very disappointed with the effect of our first shots. All three were in the kill zone of the chest of the animals, but none killed the boars outright. We examined the entry and exit wounds on all three boars, examined the internal organs for damage, and degree of ball expansion, discussed powder charges used by each of us, and on paper, those three boars should have been DRT.
No one told the boars, however.
On a later hunt about 12 years after the first, we had two men using MLers and both took our advice and used Bullets. Both had ONE SHOT KILLS, with chest hits. DRT. None of the shots taken were more than 10 yards from the muzzle, BTW.
Don't expect long shots at wild boar. It may happen in some venues, but wild boars tend to stay in forests and thick edge brush, rather than running over grassy fields in daylight. Yeah, they will run out in the open when frightened, trying to escape, particularly when chased by dogs, and those shots do occur, sometimes. But, I think that is the exception rather than the norm.
Expect a short distance, fast shot at a very angry animal. Your best chance at getting a shot in his ear is when he doesn't see, or hear you. Know the anatomy of a boar well before your hunt.
That is the best advice I can give you, based on my personal experience and observations. I do know men who have killed lots of boars in farm lots with .22s, and every caliber of pistol made. But, those animals were confined, so that making that in-the-ear, Brain shot was not asking too much. Its a bit different when locating and shooting wild boar in the wild.
Good luck to you. :thumbsup: