headspace is more critical when you're bottle conditioning. since these were pre-carbed and then filled, you have far less to worry about.
i honestly doubt you'll have anything more than a slightly louder hiss when they are uncapped. no gushers, no bombs.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10