i have been shooting and hunting deer with cast boolits about ten years or so ago. i've seen them DRT(dead right there) and run off about 20-40 yards, stand there and fall over. well, the deer "jog" off, not run off. back in the day when i used jacketed bullets, it was either DRT or RUN off about 30 -50 yards and then nose dive to the ground. all of the shots, being cast and jacketed, were either behind the shoulder or shoulder shot.
as an example, i shot a doe behind the shoulder at about 40ish yards with a 308 win and 170gr hornady rn going about 2500-2600fps and it ran off about 40+/- yards and the doe nose dived into to the turf. this year, i shot a fork horn behind shoulder at 50 yards with a 35/30-30 and 200gr fn gc(robs, 15bhn+/-) going 1726fps and it jogged off about 10-15 yards, stood there for about 5 seconds (all i could see was the tree and hind end of the buck and 5 seconds drags "turns itself" to 15 minutes) and then it fell over. i would tell you about 30-40 krag and the 165gr ranch dog(1924fps/12bhn+/-) but the deer were DRT.
with a jacketed bullet, it was easily 3"+ exit wound, while the cast boolit was about 1 1/2" exit wound. and i shot them behind the shoulder(both lungs).
i think(and do i ever!!! not. ) that the report of the rifle causes the difference between jacketed and cast. when i used jacketed bullets, the rifle it would go "BOOM" and the jacketed bullet would "punch" the deer silly. when i use cast boolits, the rifle would go "boom" and the cast boolit would "slap" or "touch the shoulder" the deer and say "excuse me."
i know i'm probably wrong, but what the heck.
15 bhn was lyman #2 with a little bit tin
12 bhn was coww with a little bit of tin