Danny,
We banter back and forth the merits of the Barnes, Partition, AccuBond, etc....
I like all of them and have used all them successfully, but you won't find me "slobbering" over any particular one.
Each has it's place and some are more practical in a wider variety of hunting situations....
but the "context" of this thread is hunting hogs with a caliber I consider minimal at best.
Too, we are not talking about hunting "feral" hogs but RUSSIAN boar which typically will be larger on average than ferals.
For this reason....I would recommend the young man use the heaviest Barnes bullet that is available.
Having killed several hundred hogs...I can tell you from experience that many bullets are "adequate" when shot angles (and placement) are ideal.
But, the deep penetration the Barnes offers....also provides the hunter "shot options" in terms of angles that would otherwise be ineffective or unethical with lesser bullets.
Much of what you have written here I agree with (conditionally), but it would require many pages of discussion about energy transfer, impact velocity, temporary vs. permanent wound cavitation, etc....to arrive at anything like "general conclusions".
Now...I am NOT stumping for the Barnes as a wholesale answer to all hog hunting questions, but in this case (small power factor and potentially large, tough animal)...I am going to gravitate toward "all the penetration I can get".
The Barnes has plenty of frontal area to get the job done:
There is a reason that the "Partition" is NOT the only bullet out there. That "reason" is that it is not the "best" bullet for every circumstance. This is a fact too plain to require argument.
It is a fine bullet...and a timeless design IMO. Less costly (as you point out) than others and perfectly adequate for many applications but NOT "perfect".
Lastly, I would vehemently disagree that the Barnes only penetrates slightly better than the Partition. It depends largely upon what type of tissue/bone is struck and what angle the animal is hit.
Shoot both into the South end of of North-bound Boar and see which one makes the entire trip. It won't be the Partition.