I shoot Brenneke KO Sabots (not the same as other hybrid style KO slugs). They are 63 caliber, 1 oz. I've shot deer at 30 and 50, and they hold together well. At 30 yds, shot through both shoulders, slug did not exit but was laying under hide on far side. It was mostly intact. The 50 yd shot was a neck shot and passed through. Neither of these deer took a step. A small sample size but I do feel they are pretty tough and will give exit holes on most hits. Better for blood trailing even if the trail is short.