I made a start on the trial blind mag stock today. I am going to use a altered military trigger where the finger piece is adjusted to the rear by about a 1/4 to bring it closer to the rear of the trigger bow so I took the one off my other 7x57 so I could get the placement of the action on the blank.
Center of the trigger face is the datum point so measuring back to the rear stock screw centre is the first move

Then the front stock screw can be marked in

From these two points the trigger clearance slot can be done and the action sat into the blank on the headless screws to mark in the other data points

And a while later it is starting to settle into the wood.