Phil, you have brought up a good question about holster cant. Happy Jack is THE expert on the rules and has replied for you. Further, based on comments in this thread, the Wild Bunch ROC will review this rule to see if some clarification is needed to be included in the 2021 rules.
Generally, if there is no clarification in WB but there is in cowboy, WB accepts the cowboy clarification. For example, in this case, cowboy rules have clarified that the 180˚ applies as soon as the muzzle of the gun completely clears the holster. At that time, the shooter must then immediately move the barrel to the 170˚ or better. Therefore, as long as your pistol is straight up and down before the muzzle clears the holster and then you immediately point it downrange you are good to go.
However, in the WB rules, I think we need to further clarify what we mean by “traditional or military design” for the holster and we will do so for our next rule changes.
I encourage you to use the WB Forum for posting WB questions.
Chair, WB ROC