174~180 Gr Flat Base .312" either FMJ, or spitzer softpoint/hollowpoint.
What cartridges would use that and how popular would it be?
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.