about 75% of those shooting a 30-06 can shoot it well.....
about 60% of those shooting a 300 magnum can shoot it well
about 40% of those that shoot a 338 Win mag can shoot it well
about 25% of those that shoot a .338 RUM can shoot it well
about 10% of those that can't shoot their rifle well will admit it.
After spending at least 50 days per year at the range,I would estimate your figures to be very optimistic.