Good point, I've always been one to "take a tree" for my shots. I didn't grow up in open country, it was all 2nd growth. We never had to look far for a rest. Up here I see guys with bipods mounted right to the rifle and they still can't keep 3 shots in beer can at 100.
I'm a lot more generous than many. My criteria was the standard 9" paper plate. Hang one at 100 and have people shoot at it from field positions. If you can't keep 5 shots in that plates center mass, or even hit it, at a given range then you need to either practice a lot more, get a rifle you aren't terrified of, move the target closer or all three! Must be others have heard the guy with the world class flinch say, "Yeah, it kicks a lot, but i only need one shot." (I'm guilty of that.) How in heck can they sight it if they pull shots 2"-4" out of center?!!! Give them a 257R or 7x57 and suddenly they turn into Deadeye Dick.
These days I'm experimenting with glasses, trying to find some setup that allows me to see the sights on my handguns. It's not going well! Rifles are better because most of mine are peep sighted and the front sight is out there enough so I can see it. Scopes are even getting a bit fuzzy though! I'm not the Lone Ranger on this and I'm sure there are lots of people banging away "at the big part" every year and making coyote supper. It's completely unethical IMO.