The curious thing was that I had a good entry hole behind the shoulder blade, but the exit was at the brest, even he stand broadside
That effect has been observed by other users of the Maxi ball. One theory I've seen posed by a hunter who observed the same thing on moose is that while the 1/48 stabilizes the bullet in flight, it does not retain stability in flesh and will often take odd paths inside the animal. Part of this is because of the Pointy nose (that's just my opinion) and part because of the low level of stability of an pretty much non-expanding slug.
Pure lead slugs need to be traveling at least 1150 to 1200 fps in order to expand reliably.
I have shot one deer (mule deer)and one elk (red deer on your side of the pond) with .50 370 grain maxi balls. The elk was hit plumb broadside and the maxi hit a rib going into the chest cavity and stopped under the skin after passing between two ribs on the far side. A perfect double lunger!
The rest of this story requires that you understand a bit about elk behaviour. To sum up, elk are not inclined to flee without identifiying the danger and it's location. Even though this bull had been double lunged, he was not sure what was going on and probably did not feel much pain. But, mainly, he did not know what and where the danger was.
I thought I had missed him! I stepped behind a small spruce tree to reload without being seen. No speedloader, just used the horn and measure to pour powder, retrieved a greased maxi from a plastic bag in my pocket retrieved a cap from my breast pocket and stepped out for a second shot. The bull saw me then and started to leave the area but fell dead before I could fire the second shot. That probably seems like it went down perfectly, but the fact is the bull was 50 yards from black timber on either side of him and he took probably at least 30 seconds or more to go down. I have had elk bolt with a double lung shot and go down in five seconds but covered 100 yards in that five seconds so you can see what he could have done in 30 seconds. That's why I chalk that shot up to poor maxi performance.
The deer too the maxi through both lungs on an angle and exited on the offside just behind the last rib. Also did a bit of damage to the liver. That deer
walked 150 yards and then layed down. I had to sneak up behind him for the coup de grace being careful not to send him running. Even though he was laying down, his ears were fully upright, which is a sure indication that he has some strength left!
That was the last animal I ever shot with a maxi. Been prb ever since and have never had another incident like the two above. Furthest any animal ever went was the one that ran 100 yards in five seconds.
Sooo, I'm not a prb user because I feel that *tradition* demands it. I don't even re-enact or have a traditional costume. I use prb because at the ranges I'm able to shoot accurately with a ml and iron sights it is more effective on game than conicals.