LOP - how to measure?

[AZ-Robert]

What are the start and end points? From trigger to center of the butt?

Horizontal line or follow the angle of the stock?

If a double trigger setup, do you measure from the front trigger, rear trigger, or halfway between?

:thanks:

 

[Birddog6]

You measure a straight line from the front of the middle of the Front trigger to the end of the Middle of the buttplate.
Set triggers are not a consideration.