Most of the time, penetration tests are not very good indicators of how a particular bullet is going to act in the field.
There are too many variables.
Even with the large "safari" rifles as you put it.
No matter the caliber, or energy, there are ALWAYS variables.
What one has to do, or what common sense says to do, is to have an EDGE over these variables.
In my opinion, although not the only one accepted of course, is that "bigger is better, but not too big to effect personal shooting abilities".
In other words, if you find it hard to shoot anything bigger than the 45-70 accurately, then go with the 45-70.
It is better to have a rifle that is good for YOU, than to have one that is going to cause even more trouble because one cannot shoot it well due to either recoil, or a host of other causes.
My 8mm Mauser is not THAT big of a cartridge, compared to most, but it is one rifle that I am very familiar with and that I trust to hit dead-to-rights spot on most of the time, even with surplus ammo.
If I were to go Elk hunting for instance, and were offered a new heavier caliber rifle that was not familiar to me, I would stay with the 8mm I have, and it is because of the simple fact that I know it's limitations and it's true abilities, both in rifle and cartridge. Possibly it would be on the very light side of Elk calibers, but I would know and be familiar with THAT gun and cartridge.
To be honest, if I were a PH, and my client pulled out his guns for show and tell, I would rather he have a .375H@H that he can be deadly with, than a .600 Nitro, that he cannot hit an Elephant at 15 paces with, and believe it or not, that has happened in the past.
So, long story short, if you are proficient with the 45-70, then go with it.
Only work up to larger calibers, as time may permit, and become familiar with those also.
Steadily work toward a happy medium, both in rifle, cartridge, and shooting abilities.
In other words, if you are just as deadly with a .470, as you are a .45-70, then go with the .470. There is no need in INTENTIONALLY going with a lesser caliber, when one is just as deadly with a larger one.
But if the 45-70 is all you can be proficient with, then by all means STAY with it.
---coltnavy36---