An acquaintance of mine did a similar hunt a while ago and he whapped a boar with a 168 J4 behind the shoulders, less than 150 yards with a .308 Win. and after a 7-8 hour search they gave up and never found the rascal. That is only one shot, one boar and one bullet so it might not mean a hell of a lot. I have shot a number of Texas critters with Sciroccos and Bear Claws and the .308 did a fine job.
It will be interesting to hear how you make out with Matchkings, might be worth having a Barnes, Failsafe or BearClaw in the magazine in case you need a second go at him.