Build yourself one of these and you'll be able to see what the pressures inside a batch of bottles is doing. Use a 50# or higher range gauge. 30# is not enough. Just fill the test bottle as you would a regular bottle when you do the batch.
#1 - 5 Gallons Harp Clone All Grain with Wyeast 2007 Lager (~5.5% ABV)
#1 - 6 Gallons Dry Irish Stout Partial (~4.0 ABV)
#2 - 6 Gallons Brown Sugar Ale All Grain with Nottingham Yeast (~5.0% to 5.2%)
6 Gallons Honey Ale AG
6 Gallons Brown Sugar Lager