I can only comment on my personal observations, which includes 22 years of hunting for a living, and the last 6 years using a Sako'd Mosin with Czeck LPS fmj's with absolutly 100% kills.
Now I do alot of hunting across tundra, and I'm not perfect, but I do have to do a second shot occassionally, as thats the way it gos!
Fact is, you must have good shot placement EVERY SHOT, or no matter WHAT you shoot it with, its gonna be wounded.
A more powerfull gun in NO WAY makes up for poor markmanship.
The Sako with czech LPS is THE most accurate rifle/ammo combination I have ever found, and at a rediculasly cheap prices.
Hard ball will do the LEAST damage to meat. Soft points do the MOST damage to meat.
9 outta 10 times I shoot them in the head or neck, only when Im not sure will I make a Heart shot.
Heres a visd from last month,
three shots at three caribou, with Czech LPS
Nothing unethical at all in using the proper bullet for the job; Since bullet placement is 100% of why something dies, I use the most accurate combination I know of and stick with it.
In the vid, all three are moving targets.
Hitting the neck bone assures a fist sized exit wound.
Its also legal to hunt with FMJ's in AK, and more than half of my fellow meat hunters use the same.
Plenty use .223 on everything, and it is ALWAYS "Where", not with "What".
Go with accuracy.