Gave some RB's a test like 9.3

! I have a large boulder about 90yds from the shed & thought I would give it a whack with some WW water chilled RB's .736 587Gr @ 1835Fps .
Got 2in of penetration in rock & found both balls from 6ft to 10ft back , 1 went 502Gr & the other 556Gr .
I was going to try my 375 H&H & 338-06 to compare , but I'm worried about ricochets !