That would be 6 volumes of CO2, not 6 bars.
6 bars is about 90 psi.
6 volumes of CO2 at 75*F is also about 90 psi.
As the temperature increases, so does the pressure.
CO2 dissolves better at lower temps, so less pressure is required.
At 32*F, 6 volumes is down to about 40 psi.
Most beer is...