Rifle's ideal centre of gravity ?

[Travis299]

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?

CofG = 4.25” in front of trigger blade & 18.25” to center butt with a 14.25" LOP trigger blade to center butt. This rifle is with a Hawke 4-16 x 44 mm Airmax compact scope. I forgot to add that rifle is of course uncocked.