Simple answer for hard cast FP bullets:
Shoot them thru both shoulder blades.
They drop on the spot, and minimal meat damage
Has worked repeatedly for me.
For 45-70 M86, 385grGC FP 9+1coww/lino/ 1740fps
For 358Win, 250gr Lyman 358318,9+1coww/lino/ Paper Patched, 2350fps
Otherwise, for heart/lung shots most they go is 100yds, leaving good blood trail.
beltfed/arnie