I shoot 190 Bergers in my 300 SAUM and have taken antelope beyond 900 yds and the bullets completely dump their load after about 12-15" of penetration at that distance. On a broad side shot, it would have been a violent pass through.
Goat was facing me, bullet entered the throat, about 3" off center, destroyed the left lung and I found nothing but shrapnel inside the chest cavity.
Velocity at impact was roughly 1800 fps
I don't know what happened in your situation, but I love them and wont shoot big game with anything else. Everything I've shot showed explosive expansion and unless I split the ribs...I rarely get a pass through on deer or larger...which is what I want.