With absolute newbies the no shoot number is 200 because we aren't sure they will be able to get more tests in and have absolutely no testing data. We know you can test if necessary and you have some data to support shooting lower than 200
Many of us routinely shoot even below 100 but we have multiple months of testing data to support it. Ideally you are trying to find a dose that holds him between 40-120 as much of the day as possible so eventually you have to learn to shoot low to stay low.
Mel and The Fur Gang