This right here is the problem. I have met many of these types of “hunters”… totally half assed approach. Cheap rifle, crap scope, crap rings, cheapest ammo (sometimes different types at once), “zero” the rifle on a paper plate with a couple of shots while leaning over the hood of the truck, no practice, etc etc…
This is a people problem, not a 243 problem, and honestly an embarrassment to the hunting/firearms community and totally unethical/irresponsible behavior.
Your experience is based on the worst of circumstances and behavior; garbage in- garbage out.