There some truth that more velocity can reduce penetration.
Barns did a test with ballistics gel at 100 yards. One block was shot with a 30-06 and the other block with a 300 RUM, both shooting 180 grain TSX. They set chronograph behind the blocks to record exit velocity. The 300 RUM exited with 49 FPS, the 30-06 extra with 247 FPS. Obviously the 30-06 would have penetrated deeper. The wound channel from the 300 RUM was larger
Clair Reese wrote the twst from in an article
The next question then with that specific Barnes bullet is, does the amount of penetration in an actual animal, still enough for a exit with the RUM with that bullet at whatever impact velocity they chose?
What animal where they trying to equate if any?
Next, do you want a larger more traumatic wound combined with a greater hydrostatic shock, versus less shock and a smaller permanent wound channel?When you begin to add in further distances to the mix, the RUM will end up having the same or similar expansion and trauma as the 06 does at shorter distances, with that specific bullet.
Since they are only looking at 100 yards, did they slow the speeds down to equate lower impact velocities for further distances?
I am betting, if they had compared solid bullets of the same type in those two rifles, the RUM would have greater penetration.The information does not surprise me
