Well I found an answer for my own question a few days ago. I loaded some up in my 300 weatherby for a pig hunt. I got one pig in the head as it was coming towards me. I found the jacket in the arm pit area and it looked like the core came apart in a few pieces. It only travelled 30 cm (12"). I got another pig behind the shoulder as it was running away and it didnt exit either. It looks like the 250gn bullets dont penetrate all that well ,so Im not going to use them for scrub bulls like I was intending to.