Ain't that the truth! All three of my current big game rifles will occasionaly do
sub-moa, if my wiggles compensate for my wobbles, etc. However, a once in a while sub-moa group does not a sub-moa rifle make. On average I'd say my groups go about
1-1/4" to 1-1/2" for 4 or 5 shot groups, with factory ammo as I no longer handload. I'd say that's dang good accuracy for out of the box rifles. Folks should be happy if their rifle, out of the box, gives them 1-1/2" (+/-) groups for 5shots.
What's better, take a target and shoot a group one day, save the target, then shoot a group a week or two later with the original target set behind the new one. Keep doing this for a month or two, every couple weeks. If your rifle keeps them in a group of
2" or less on the orig. target over time, you've got a gem - hang onto it! That sort of accuracy & consistency is rare. I'm lucky in that I've found one to do it, and shoots several different factory loads to the same POI.
I think the majority of sub-moa claims are done with rifles that have been modified some. Maybe some bedding work, triggers lightened, barrels re-crowned, use of handloaded ammo, etc. I've only had one that consistently shot sub-moa out of the box, and it gave me approx. 1/2" to 3/4" groups with factory ammo it liked. The rifle was a Rem. 788 with 18-1/2" barrel, Tasco 3-9x scope, 243Win., using Fed. Premium 85gr.HPBT. Like a nut, I eventually coveted something else, and traded it off - at the time, much to the delight of the local prairie dog population, I'm sure