As long as the wood is sealed, whether oil finish or varnish type finish, it will hold up rather well. Problem areas on bolt rifles are under the barrel and trigger area. A regular application of a silicon spray will keep out most moisture. Most problems come from storing a wet gun. If you get one good and wet, wipe it down when you leave the field and spray it down good with WD-40 getting in every crack and crevice. Let stand for a minute or two. then wipe dry with clean lint free wipe and then with a good silicon gun cloth. When you get home remove gun from case, never store a gun in a gun case. Lube gun as the WD-40 washed out what was there, let gun stand muzzle end down for a day or two and you will have no problems.