Free: Contests & Raffles.
Take what you need to break it down and clean it to camp. If it rains I would empty and fresh load each day. For me I take a gun vise to camp.
unloading... just fire into a tree or the ground... or if you want the rich peoples way, there are CO2 kits that attach at the nipple and push the charge out with compressed gas... a lot of the newer rifles come with a removable breach plug, if thats the case you can remove the breach and using your ram rod push it out....good luck