What I do and have done for years.. get some handi wrap out of the kitchen. That stretch stuff that kind of seals to everything. Take a small piece and a rubber band (the little ones you buy in a craft store work great. That also work good on my turkey box caller) and after you have stretched that plastic, put the rubber band on it, before the sight or after the sight it really should not interfere with the bead...

On the cap, a little more of the stretch wrap over your cap, and close the hammer down on it. Make sure the cling wrap goes all the way past the base of the cap. When your ready to shoot, cock the hammer and let fly right through theplastic that covers the cap. It will go off.

Also try and keep your muzzle pointed down when your sitting or walking. Why risk the water if it is raining or snowing. Some people carry a large piece of the handi wrap and if they are sitting will cover the hammer and the nipple area of the rifle. They also sell something called a cow-knee it is a leather (waterproofed) sleeve that fits over the lock and frizzen of the flinter to keep them dry. It will also work over your cap lock when your sitting. You can make one out of scrap leather or improvise.... For years I carried a chunk of waterproof leather that I used to cover the hammer and capped nipple with... I also tend to hold my gloved (waterproof glove that is) over that area to keep any moisture out of the way.

The part about hunting in cold weather and then bringing your rifle into a warm area, listen close to that good advise. When you walk in out of the cold wearing glasses into a warm house or car, what happens? They fog up. Well so will the inside of your rifle barrel, but then the moisture will run backward towards the powder charge. That is why they are telling you to be careful of your climate and temperatures....

Personally I do not bring a loaded rifle into the house. If I am going back out hunting I store it in the unheated workshop entrance, or if I am through for the night, I fire the projectile off, clean the rifle, and start fresh in the morning.. Many people leave them loaded all season without problems. The choice is yours.... If you do have to leave it propped somewhere, put it muzzle down, with the handi wrap off. Any water will then run out the muzzle instead of back into the powder.

By the way ... good question. This is an important topic this time of year and many forget the basic rules...