You will get a lot of different opinions on this, so here's mine:
:imo:
It's a GOOD thing to be ultra-paranoid about corrosion.
:applause:
I never hunt with a fouled rifle...always a clean bore. BP fouling IS hydroscopic. (sp?) Before I load for a hunt, I go through a VERY meticulous, careful cleaning procedure, to get ALL oil and traces of, out of the bore and breech. Dry rags, paper towel, pipe-cleaners. I firmly believe that it is not moisture that causes miss or hang fires, 99% of the time, but rather oil or traces of oil in the gun.
Anytime I target practice with the rifle, I always fire my first shot at my "first shot from a clean barrel target", and keep a good record of where and how the rifle is grouping from a clean barrel.
Don't know if it's luck or what, but my rifles seem to shoot real close to where they do with a fouled barrel...but maybe an inch or two higher at most, which I take into consideration when I sight the rifle in. When I sight in a rifle for the final time, I even go so far as to clean, not just wipe, the barrel beween shots. (which is pretty easy actually, as you are not cleaning the whole gun, just the bore)
I also do not fire the gun off at the end of the day, clean and reload. I will leave it loaded for weeks at a time, and have never had problems with miss or hang-fires. The secret to that, again, is how well you prep/clean the rifle, and get ALL oil out of the breech and barrel before loading it with your hunting load. Using real BP also goes a long way towards getting 100% reliability.
Anyhow, if you know where your rifle shoots with a clean barrel, and sight it in accordingly, then there is no reason to hunt with a fouled and dirty gun, which in addition to the possibility of corrosion, can lead to miss fires and hang fires. Again, sometimes there is very little difference in POI between a clean and lightly fouled barrel.
Hope that helps!
:yakyak:
Rat