fruit lambic, grolsch bottles?

[MTHarrington]

Anyone know the working PSI of grolsch, swing cap, style bottles?

I'll likely be pressurized to around 4 volumes of co2...

I am making a fruit lambic that follows this process (sour mash via Papazian)
http://www.brewboard.com/index.php?showtopic=29637&st=0

I have 3 cases of Grolsch bottles.... and would like to use those, but maybe I'm forced into champagne bottles here, I don't know...

 

[Suthrncomfrt1884]

I think you'll be fine. Those bottles are fairly thick.