In my experience, BH 209 doesn't draw moisture from the air, certainly not to the extent of black powder or substitutes. I've left mine dirty for days with no signs of rust, albeit mine is a nitride barrel so that could be a contributing factor. Light coating of oil and then a couple dry patches...
Been using this forum for several years in researching various shooting/hunting situations. There is definitely a wealth of knowledge in this collective and. Born and raised in north Louisiana, now living in south Arkansas. Hunting and fishing for most everything there is around here. Dad got us...