I use electrical tape on ml and cf's, never had a problem with it coming loose. On a ML I put two piece over the muzzle so I have an overlap on the edges of the barrel then a wrap around the barrel and these overlaps. I have hunted as cold as -30 celsuis and never had a problem. Though when extremely cold I wrap my barrel prior to subjecting it to the extreme cold, so at room temeprature or close too.

Like mentioned, balloon or finger cots also work. PLEASE DON'T PUT ANYTHING IN THE MUZZLE[]!