Gentlemen,
Again, thank you all for the effort put forth in your responses. I must confess, I believe that this forum joins wisdom, experience and common sense on what can be a very complex subject.
It seems at some point along the way the wheels came off the cart and I need to back up the bus just a tad.
I have come to the conclusion that for a PG rifle, the .375 Holland, while perhaps just a little over-gunned, offers pretty substantial performance out to about 300 yds. All of these shots are not going to be stock still broadside views so I feel the .375 offers a little extra insurance on a less than optimum shot.
Now I know all about shot placement and would never take shot that I felt in doubt about, however, I have hunted for almost 50 years and accept that when dealing with wild animals things do happen and a .375 is going to cover a lot of sins.
So my PG rifle will be the .375 Holland throwing a super - premium bullet like a Woodleigh Hydro or Impala. I shoot the gun a lot and am quite comfortable with it out to about 300 yds.
Then why the .416 R, well this is where I seemed to confuse everyone. It's really quite simple though.
Moving to a little different kind of set -up where you would combine buffalo with something like a sable or roan, and I believe that was the example I previously spoke of, I considered two (2) elements:
#1 I just would prefer not to have a close and personal discussion face-to-face over muzzle energy, ballistic coefficients or bullet selection with a less than fully entertained cape buffalo. While the .375 Holland is adequate to the task the .416 R picks up the pace substantially when confronting an animal not thoroughly enamored with my presence. Besides, my gray-haired Mother will sleep better.
#2 If, in the process, I happen upon the sable or roan while in possession of the Rigby, I do not feel either will take personal offense. Inside of 250 yds it seems to me to be a workable arrangement and all present will just need to deal.
So, there is my rational in a nutshell, two entirely different rifles for two entirely different hunts. I know it leans toward the heavy side and I accept that and perhaps in the future I will make changes. however, my desire now is to get there with one rifle sufficient to the task required in each of these two distinctly different hunting situations.
Finally, there is a school of thought that would suggest ditching the .416 and taking on all comers with the .375 and I also find considerable merit in that approach.
As always, input, comment and advice is always welcome and appreciated.