I just bottled my first home brew ever and I am really excited. I do have a question, though. I filled each bottle about 2 inches from the top and I was wondering at what point I should worry about bottle bombs. This is a relatively low CO2 volume beer (I added enough priming sugar to make 2 CO2 volumes, taking into account residual CO2 from fermentation), so I don't think I should worry, but I just wanted to check here first. Thanks.