Exact same setup as you. My barrel length is 21" not sure yours?
I shot the Federal tss 9s, 2.25 oz.
Got 330 in 10 in and 314 in 20. Total 644 or 80%.
Just polished my barrel. Interested to see what that does, and warmer weather.
Sent from my SM-G955U1 using Tapatalk