MPBR is that range at which the bullet is the same amount low as it's maximum amount high.
If you sight in to be a maximum of 4" high, your MBPR would be that range where you are 4" low.
In the example above, you would be 4" high from 150-160 yards and 4" low at 327. To sight in for that, you'd want to check several ranges as you can't count on the bullet to exactly match predictions.
Personally, I don't like to be that high. I want to be 3" high at the most and I like 2" better. 2.5" high at 130 would put you 2.5" low at 275. That's closer to what I'd want. I don't like having to think about aiming low for close shots.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.