Having hunted with a sidelock in the winter ML season on the west side of Washington State for the last 25+ years where an all day rain with a little sleet mixed in for 5+ inches of precip is a daily routine, the answers have been (1) vinyl coated nylon poncho's that covers you and the gun, and (2) plastic tube nipple and cap protectors that slide over the cap and nipple exposing just the end of the cap. Side benefits are (1) that dark green poncho with rain on it allows you to look just like a small evergreen three making it amazing camouflage that the deer or elk just can't figure out , and (2) the plastic slide on cap protector also helps focus the flame from the cap to the charge. Sorry about the run-on sentences.