RE: Shotgun slugs/hunting
What do you want to do with the gun? If you are talking close up stuff I would use a heavy non jacketed slug and sight it in dead on at 50 or 75 yards.
If you want to shoot longer distances then some of the jacketed high performance stuff works well because they have better ballistics. You just have to play around to see what you gun likes the best. Which can get expensive.
I personally think for close up stuff the slower heavy soft lead slugs transfer much more energy and really nock a deer for a loop when hit. They just suffer in stability and trajectory at longer ranges. I think the jacketed bullets provide more penitration than is needed for deer sized game. Some like that though. It's just a personal thing with me.
Paul