You can pm Sumtoy on here directly to get info on his chokes.
My Trulock HW7 choke is .560, they do make a regular turkey choke that resembles the Carlsons that may come in .570, not sure....
It is their HW choke that most people are referring to when they mention Trulock.
Seen great patterns with both.
What .570 choke are you shooting now, factory ?
2015 Old Gobbler contest Champions