Here is a benchmark that may help, or may spook! Last weekend. I was check-sighting a forend-tip pressure-point bedding job on my .243 (covered in other posts).
I am claiming about MOA accuracy for two 3 shot groups. Actually they both went a bit over that, but less than 1.25. Firing was a measured 109 yards.
My "bench" was two daypacks in the back rack of the snowmachine as a fore-end rest, with the stock heel resting on the seat. I was kneeling in the snow, shooting one-handed. I could get a pretty good hold that way, but I noticed my heartbeat was moving the crosshairs beyond each side of my target point. Verticle was much less. Target point is a 2.5 inch black bullseye on 8.5x11" copy paper (I make my own), with a one inch white circle within the black. So I was getting an estimated 4" side to side scope-hair variation from my heart-beat alone. I had to anticipate....
Not much to "prove" a gun's accuracy, but not bad as a "pretty good" test of field -use practicality.
As Ron White would say "That's a valuable piece of information".
I'd shoot the thing on caribou to 300 yards now. With a rest.
