Rifle's ideal centre of gravity ?

[angrybear]

Are you trying to scale something up from a picture ? or does the picture have nothing to do with the assumptions that follow ?
Really don't understand what links to what.

C of G is personal choice, some people like a rifle butt heavy others like it barrel heavy, I like it just in front of the trigger by 110 - 120mm so that it will balance on my leading hand.

[Shed tuner]

in terms of accuracy, for a springer, I find about 6" forwards of the trigger blade is optimal...

Butt heavy guns (like many bullpups), I find have a tendency to wander around on freestanding shots. That's why I'm quite liking my semi-bullpup compatto at the moment.. it's a nice compromise where you want a compact rifle. But rested, or off a bipod, it's not relevant,