Any wood stocked rifle, made by any company can, and will expand and contract as temperature, humidity, and altitude change. Just a fact of life and no amount of sealing the wood will prevent all of it, just reduce the possibility in extremely wet conditions.
As the wood changes because of environmental conditions it puts pressure on the action and barrel in different ways. The changes are often so minor that most folks won't even notice. Sometimes it is bad enough to actually cause the wood to crack or split.
Most often it simply results in minor point of impact changes. All of my wood stocked rifles will shoot very good groups, but I've never had one not have to be re-zeroed every few months. Zero the rifle in the Spring, and by Fall it will still be shooting small groups, just at a slightly different place on the target.
I use only quality synthetic stocks on my go-to hunting rifles to prevent this and to also reduce weight.