With modern industry innovations, some caulking guns now come with a no-drip feature that prevents the pressure of the gun from pushing too much caulk out. However, if you are stuck with an old school caulk gun, one easy trick will prevent caulk over flow.
Just wrap your preferred caulk or sealant cartridge with brown parcel tape before loading it into the gun to prevent the cartridge expanding with the pressure of the skeleton gun.
Essentially, this means the caulk flow will officially stop once you release the trigger instead of continuing to drip. This may also help you to apply a straight, even bead. Easy and cheap!