Those with a database may be able to tell me as I only have a small sample and i want to see if if my sample results hold up over the long term.

The system rules are:

The top 5 in betting
Barrier 1 to 9
weight between 53 and 58
Winner at the track and distance +/- 200m

from 150 races there have 124 winners a s.r of 82.7% which seems to be out of whack. But results are results in my book.