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In army, we used medical tape in winter. Applied to the firearm stock and metal in 3-4 inch strips at irregular angles. Not too much just break the outline.
Just don't wrap it tightly around the barrel and the forend you will change your point of impact.
I've used it for years on my coyote rifles and occasionally on my hunting rifles if I'm hunting in snow never had an issue with it.
I was also wearing white polar fleece coveralls cause I had to walk across the middle of a 700 yard logging cut took them off before I started working on the deer so they didn't get any blood on them.