Steve, Rod, (9.3x57) did a bit of a bullet study on penetration
with the Privi bullets, 286gr. He found them on the soft side compared to other bullets tested in his media, including the 300gr. sized down .375's Interbonds as well as the 235gr..375's Speers and .375 225gr. Hornady SP's I sent him for testing in his 9.3x57.
He was driving the 235's at 2,450fps and the 225's at 2,550fps. They matched the penetration of his .375H&H using 300gr. Swift A-frames on his steer head, 1" plywood and jugs filled with water media.
We were both very impressed by the performance of these sized-down .375's which seemed to get tougher when sized down.
On a frontal shot on the steer head, the 286gr. Privi stopped in the first vertebrae after penetrating the skull's front, brain and bone casing, then stopped on the board on the back side of the first vertebrae. The 225gr. and 235gr. each penned 2, 1/2" plywood boards, a water jug and stopped in the second jug (as well as the 300gr. Swift A-frame). The
Privi stopped on the first board at the back of the skull.

How that computes for you, I don't quite know, but if I wanted both penetration and expansion from my 9.3x62, the sized down .375" 235gr. and 225gr. were very impressive.

The sized down 300gr. Interbond's were like bubble-gum - huge expansion but hung together, kinda like the old 405gr. RP's .45/70 bullets driven 1,800fps or slower.