When you are dealing with big heavy bullets the FPE is not as important as it is for the sub calibers. That is why so many Bison fell to 400+ grain bullets from the 45-70 at 1200 fps. Those big bullets do alot of damage. Regardless of how much energy they put out. Heavy bullets are just different.

Did you see anything published from Speer saying what the minimum velocity is for expansion of the Deep Curls?? I am going to give the 300 grain Deep Curls a run here in a couple of weeks. The bullet should be devastating, even if expansion is minimal. Tom.