If you have enjoyed the privilege of hunting for many years, and shooting a goodly number of Deer, Moose, Elk, etc, you see bang-flops fairly frequently, even on lung shots.
However, I do NOT expect that, and a shot through the lungs will shortly find the animal on the ground anyway. I cannot personally recollect any properly lung shot big game animal that made it past about 80 yards. In the vast majority of cases, 25 yards or less.
I once shot a startled Elk at about 75 yards that was running flat out, slightly angling away. The elk ran an additional 35 yards and died in mid stride. There was about 3" of snow on the ground, and when the Elk hit the snow, he slid about 15 feet, deader than a doornail. Shot through both lungs with a 160 Partition from a 7mm STW.
A similar shot on a smaller bull moose that was running broadside stopped him in his tracks. He died right there, double lung shot with my 308 Norma Mag/200 Partition.
I once shot a smallish muley doe with my 270. This deer was unaware of my presence, feeding in an alfalfa field. Shot was broadside at 110 yards, 130 Partition. At the shot, she took off like she had been stung by a bee, running straight for the barbed wire fence. She ran 58 long steps and hit that fence like she never saw it at all. She dropped and never even kicked.
How much further would she have run if the fence wasn't there? Who knows? But I'm guessing not very far....she was dead on her feet.
Bottom line? Shoot them in the proper place, they will be dead nearby, if not right there. Eagleye.