With respect Nath, I do not think that you interprited my post in the way it was written. Perhaps I was not clear.
What I was attempting to point out that in even proven big game calibers one requires both penetration and expansion to sucessfully anchour an animal if the hit is not to CNS. This promotes massive blood loss and rapid drop in blood pressure.
By explaining my experience by accident with one of these calibers and the wrong (high penetration but non expanding bullet). I was attempting to explain that IMHO less than ideal calibers that have been made to acchieve long penetration by the use of non expanding heavy for caliber projectiles that may give less than adaquate performance on large game.
That they will kill is indisputible, however as in the case of my Blesbok it died unrecoverable in 12,000 acres of Mopane. (It was gone from the herd the next day)
On the 2007 Levrguns Safari, Marlin made nice one shot kills with a 45-70 with Leverevolution ammo.
From what I have seen clean pass throughs with non expanding bullets may result in lost game.
This whole issue was done in the early 1900's when the big game rifles went from solid lead and blackpowder, to NE cartridges and jacketed soft points.
10's of thousands of the largest creatures on the earth were killed in the next 40 years, nobody that hunted Africa or India wanted to go back to the old lead solids.
These current special 45-70 cartridges generate almost identical balistics in term of bullet weight and velocity to turn of the centery BPE cartridges. At that time such .45 cal rifles were considered small bores. The .577BPE class being mediums and for the big game (ele rhino buff) 4 bores were preferred 1750 grain heads @ 1500 fps.
That we are doing it now is because people want more killing power from the 45-70. Because its performance is marginal with softs from the wrong angles with (major manufacturer)factory ammo on the largest game.
As a solution I am working on Regan to build a .450 3 1/4 NE in a lever action, but he is not biteing at the moment
Regards