My accuracy quest started with a Lee-Enfield No.4 Mk I that was box-stock (well, as much as any of those are...) It was a rifle, and it shot - but that was about all I'll give it. Having shot very accurate 22s on the small-bore team at school, I was ready for full-bore, but that rifle nearly killed it. Frank (the coach) looked at us little guys after that shoot and said "OK - you four there, swap your rifles for these ones" and pointed to an MOD-green (This is the UK, we have an MOD, not a DOD) box full of padding and shiny things.
"These ones" were the team rifles - worked over by Parker-Hale, with P-H peep sights and super-slick bolts. What a joy to use, and SO much more accurate than the others. But he wanted to see who would do what with the service rifles as they stood.
"Mine" was no. 9, and at her best she would shoot 1.5 MOA (9" at 600 yards) using a sling-and-elbow hold. No baby rests or sandbags.
At college in the States, I was lent a Winchester 52B, which UI still have. If she WON'T shoot sub-MOA with a sling I know I'm out of shape. I do love bipods now that I'm "older", but the 52 stays with a sling.
"We have met the enemy and he is us." Pogo.