I'm probably not the sort of guy you're looking to poll. Quite frankly I doubt that I can out shoot any of my rifles.
Does ammunition play a part? Of course it does. Am I buying $20+/50rounds ammunition? Not on your life. (see previous statement).
I've come to the conclusion that just about anything "standard velocity" shoots the best, with some brands better than others, but CCI Standard or S&B Match (the budget stuff) are my go-to choices and I certainly don't care what lot numbers they are.
These days I prefer reactive targets - I've lost interest in chasing small groups: give me a can on a string.
https://rumble.com/v79jwh6-sweet-n-short-how-do-you-22.html