Today I did your drill, just for the fun of it. I was on an 8' GC5 table, simonis cloth. I know exactly where I stand in the pool world. I've been playing this game for 15 years, gambling against all caliber of players the entire time. I'm a high C player, with ranges of B on my good days. If I go to a bar or predominately banger pool room, people there will say to me "you should play on the pro tour". Those poor souls have no clue, lol. In a "player's" pool room, I'm at the bottom of the pack of real "players". Below are my scores for 10 racks. Note, I counted the break shot as a stroke, took BIH after the break, and did not penalize myself for scratches on the break (I never scratched during the run outs).
Rack, Ball on break, Scratch on Break, Misses, Total Strokes, Comments
1, 0, Yes, 1, 17, Missed 1st ball
2, 1, Yes, 3, 18, All misses were last ball
3, 1, No, 3, 18, Missed 1st ball
4, 0, Yes, 1, 17
5, 0, No, 1, 17, made one 2 for 1 shot
6, 2, No, 0, 14
7, 0, No, 0, 16
8, 0, No, 1, 17, Missed 1st ball
9, 1, Yes, 2, 17, Missed last ball
10, 1, No, 0, 15
Average number of strokes to clear all 15 balls over 10 racks: 16.6
You can see I had 3 of 10 racks where I missed zero balls. I had 3 racks where I missed the first ball, which was BIH. This is because I was trying to do something fancier to break out a cluster in order to run the whole table. Also a couple racks I missed the last ball. Its easy to "run out of position", and it comes back to bite you towards the end of the run. You can also see that my break sucks, as I made a ball only in 5 of 10 racks, and had scratches on 4 of the breaks. No worries, as I prefer to play one pocket
A top local player (A level), will easily have zero misses almost every rack.