Finding correct volume using NVT calculations

[bharat]

Hello experts,

I have run series of NVT calculations using different volumes to find the 
correct volume. Since something going wrong with NPT, I decided to do like 
this. My understanding is whichever volume gives ZERO pressure, that is the 
correct volume. Unfortunately I am getting huge pressure around 
(-0.408670198625E+06 bar). Pressure is more or less conserved. I presume I 
have to calculate delta_Pressure, but I don't know between which values.

Can anyone tell me how and what to compare these simulations to find the 
volume?

Any suggestions are appreciated. 

Thank you. 

Bharat
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