BeddingNo 4 receiver recoil lugs

[CINDERS]

From what I recall reading somewhere the angle is 70 degrees and the line of wood behind those brass shims (Draws) appears to be about right. But I agree with getting a second hand sportered stock bottom wood and practice on that and remember the old adages - measure twice cut once - if in doubt ask as people like Peter Laidler and Brian Dick and others are only too willing to assist or as you have done look up the threads