I don't have one, but I have shot a .40 in 13/16 x 42 barrel for many years...I use 25grs of FFF for squirrels...I have shot up to 70grs of FFF just for kicks and it was still very accurate...

My barrel is a Rayle, with 1-48 rifling that has .015 deep cut rifling...

If using for coyotes, I'd go with 60grs FFF...I use 40grs for 50 yard target work...