Which sling arms transport method is primarily used during inclement weather to keep moisture out of the bore?

The method of transport that is primarily used during inclement weather to keep moisture out of the bore is weak side sling arms transport with the muzzle pointed down. This position minimizes exposure to moisture by orienting the muzzle downward, allowing any precipitation or moisture that may accumulate to run off away from the open end of the bore. By keeping the muzzle pointed down, it effectively reduces the risk of water or other contaminants entering the barrel, which can negatively affect the rifle's performance.

In contrast, other methods like strong side sling arms transport with the muzzle up could allow moisture to enter the bore more easily, especially if it's raining or if the rifle is exposed to wet conditions. Cross body sling transport and over the shoulder sling transport also do not provide the same level of protection for the bore against moisture, as they do not specifically direct moisture away from the muzzle. Thus, using the weak side position is a tactical choice that ensures better maintenance of the firearm's integrity during adverse weather conditions.