3 Bullets vs Concrete - Big Horn Armory

We decided to revisit concrete blocks since Underwood Ammo sent us some Xtreme Penetrator rounds. We compare a 600gr hard cast, a 700gr hard cast and a 350gr Xtreme Penetrator. After reviewing the footage we notice the shot with the 700gr bullet hit low on the block, causing the whole thing to fracture due to shock and not penetration, so it didn't shoot through the center like the other 2 so we're going to try the 700gr bullets again to see how far they'll penetrate compared to the other 2. We think it will match the Xtreme Penetrator performance, what do you think?