Get some anti-seize grease, (like choke tube grease), and using a tooth pic, put some on the nipple threads. When get back from the range, tap the barrel wedge out, and remove the nipple. Take the lock out and clean, all around the hammer, and up in the recess of the hammer. Use the range rod and a plastic bucket of water, to pump water up and down in the barrel, to clean it. Run patches in the barrel, and check for fowling. Then run lightly oiled patch, in the barrel. Clean the nipple, put grease back on the threads, and snug it down, with a nipple wrench. Over tightening, is unnecessary, and will put more wear on threads. Wipe stock down with something like Johnsons paste wax, and the rifle will last for years. Run a patch down the barrel, and check for rust, for a couple of days, and then once a week, and then once a month, or until you use it again. To keep it from being such a chore, I will often clean the barrel, nipple, and lock, then leave it until the next day. You'll develop a routine, and it will get easier. I hate rust, did I mention that.