As you may or may not know, I shoot hundreds of hogs per year. The best advice I can give you is this:
1) use very tough bullets. 85 grain TSX is my top choice because they are driven fast, have flat trajectory, and penetrate very deeply including through the shoulder blades. The hog is a double-tough animal. Deer bullets are not necessarily hog bullets. My second choice is the 110 TTSX (until they make a 90 grainer) and third is the 110 SPH.
2) If the feeder is really 170 yards, then you will need a higher mag scope, like 10 X, to place the bullet. When you have 10 hogs under a feeder, you won't be able to tell the asses from the heads (kinda' like with politicians :lol: ). From that distance, and with the hog's propensity for coming out under a feeder just at dusk, you will be hard pressed to know where you will be hitting it. Otherwise, I would recommended that you get a little closer.
3) Hunt at night. They are mostly nocturnal in any place they've been hunted. If you have access to night vision, get that. If not, use lights.