I think you might be able to go as low as 10% or fewer if you make the sample include all rifle shooters. There’s a lot of factors in play. Hand
@Lowlight (or any of us) a 300 winmag and unlimited ammo, known to shoot sub 1 MOA, and he will stack rounds until he gets fatigued to the point at which he lets something slip and sends one outside an inch. Does that mean he does or does not meet your criteria? You give me my match rifle and ammo and I will shoot under 1 MOA, from a bench or prone or from a stable standing barricade, until the barrel burns out. Now it’s going to have to be cleaned at some point. Do I get an allowance for the first shot after cleaning or am I expected to know where that shot goes, compensate, and keep it in the 1” circle? Are we doing scope or open sights? Bolt or gas gun? Hand loads or factory? Even at 100 yards, it’s a complicated question that could have answers ranging from somewhere near 100% to somewhere near 0% depending on a whole slew of factors. Out beyond 100, the results get exponentially worse.