I have a lot of rifles, in fact several that have been identical builds, but only a few that I could shoot a 5 shot group under .5" on a consistent basis, and one, I think I actually cried a little when it fell off from consistent 0.3" 5-shot groups. Now 2 barrels later, it has still not gone under 0.60" for a 5 shot group.
My guess is that it is less than 1% of shooters that have the numerous abilities it takes to shoot sub 1/2 MOA at any distance for 5 shots even given a rifle that is capable.
I got to shoot with a few really old guys, (their guns) in a tube with manually stabilized (bags and pods, etc. as opposed to machine rest) rifles that they were printing 6 10 shot, dime sized groups at 100 yards on 3x5 cards. Out of 6 groups, they would almost always get a few that were in the 1/4" or better range. I have also been in the tunnels of 3 ammo manufacturers and seen the groups produced by quality barrels in machine rests and their best ammo, little of it is better than 1/4" and most around 1/2".