5 and 7 yds. are good close quarters distances to practice at, with a pistol. In the real world, those are where you are most likely to need to defend yourself, with someone else right in your face.
The other progressively increasing distances being 10, 15 and 25 yards.
For the Calif CCW test in my county, you need to hit the 8 ring 80% or more of the time with 40 rounds at varying distances between 5 and 15 yards, timed, with both hands single handedly as well.
Right handed is easy for me. Left handed is not so good. I rarely practice left handed, and especially not one-handed. But that's in the test.
I'll go to the range tomorrow morning to practice what I learned in the class I had to take for the LTC. And I'll keep practicing until the Sheriff's Dept calls me in for the test.