This year so far all ive use is a 30-06 with 150 Rem. core lokts. Only one doe ran because i hit her about 4'' farther back than id like,she went about 50 yards but the blood trail was so heavy Stevie Wonder could follow it lol but from ranges 50 yards to 130 yards all were DRT's not even a flinch. I have recovered 2 bullets from the deer but no fragmentation at all. So i dont know why the 180 gr. bullets would fragment.