I have used slugs to kill two black bears, both of which were over 300 lbs. using 3" Brenneke Black Magic Slugs. I have also taken a 710 lb moose with the same slugs. All three were one shot quick kills. One of the bears and the moose were complete pass throughs after breaking one shoulder. The other bear was also a shoulder shot. Both shoulders were broken and I found the slug right under the hide on the far side. Believe me when I say that with the 3" Brenneke Black Magic slugs, penetration is not a problem! The muscle and bone that make-up a 360 lb black bear's shoulder is not insignificant. To penetrate the hide, fat, and muscle and still break both big shoulder bones is no small thing for any slug to do on a 360 lb. boar bear.