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The spell Life Bubble, surround the touched creatures with a constant and moveable 1-inch shell of tolerable living conditions.
Does this lay of air allow you to fire off firearms underwater or a vacuum?
Description
You surround the touched creatures with a constant and moveable 1-inch shell of tolerable living conditions. This shell enables the subjects to breathe freely, even underwater or in a vacuum, as well as making them immune to harmful gases and vapors, including inhaled diseases and poisons and spells like cloudkill and stinking cloud. In addition, the shell protects subjects from extremes of temperature (per endure elements) as well as extremes of pressure.Life bubble does not provide protection from negative or positive energy (such as found on the Negative and Positive Energy planes), the ability to see in conditions of poor visibility (such as in smoke or fog), nor the ability to move or act normally in conditions that impede movement (such as underwater).
When you cast this spell it has a total duration of 2 hours per caster level. You can divide this duration up in any manner you wish, not necessarily equally, between up to 1 creature per caster level.
The question would raise whether Life Bubble also surrounds gear. Say if it was used on a horse and buggy, being worn by the horse, is the buggy protected?
Either way, the firing mechanism is within 1 inch of the hand for most firearms, so you could I would rule, for sure at least fire it without ruining the powder.
Reloading then becomes the issue. Magic items at the level of a character able to cast 3rd-5th level spells can make such reloading doable, and there are even items that allow firing underwater. Ignoring those though, with just Life Bubble, I would say even if it did cover gear, you would be unable to reload a simple firearm.
Needing to pour the powder into the barrel would pass it out of the Life Bubble. It specifically doesn't make moving easier underwater, so it would impede the action.
EDIT: For a vacuum, I'd say fine on the reloading and firing. Just not water, as passing out of the bubble would expose the powder to water and ruin it.