What experimental bounds do we have on big $G$?

Question

I know that there has been a large amount of controversy surrounding the exact value of the gravitational constant $G$, but I know that there is not a substantial difference in the measured value. So I was wondering what experimental bounds we have on it so far?

Answer 1

This page shows the range of some measurements from 1982 to 2014. Basically, it looks like arguments could be made for any value between -460 to +250 parts per million below or above the commonly accepted value of 6.67408 x 10^-11 m^3 kg^-1 s^-2.

http://iupap.org/working-groups/wg13-newtonian-constant-of-gravitation/

Answer 2

According to NISTconstants, as of 2017, $$G = 6.674 08(31) \times 10^{-11} \space {\rm m}^3 {\rm kg}^{-1} {\rm s}^{-2} $$ which means the range is 6.67377 to 6.67439

It's not the easiest measurement to make, large forces from electrical, magnetic, and other sources have to be considered.