Okay, here is my calcs.
Now I did 3 tests yesterday on my Gallons Per Minute - they all hovered around 7.
Previously when I had measured this it was about 9.
I just did this with the faucet fully open, this is a faucet about 10 feet from where my copper comes out and backflow is installed.
The first file assumes I get a lack luster 7GPM
I also put the chart for the sprinkler heads I was planning to use on there