Looking at picture of a good rifle with mounted scope for sale. It's resting on a narrow box and in balance.

Butt to trigger blade 74
Butt to CofG 88
Total length with moderator 190

Assuming the total length of the rifle is something like 1 mtetre and scaling, that puts the CofG 460mm / 18½ inches forward of the butt, and the trigger blade 75mm / 3 inches behind the CofG.

My (fairly heavy) 80K and scope CofG is 480mm / 19 inches forward of the butt and the blade is 120mm 4¾ inches behind CofG. I'd prefer the CofG to be further back than that but that might affect the stability of aim.

Are there any rules of thumb about these things?