Well, I will assure you linseed oil will let you down in wet weather. I've built guns and used it 30+ years ago and have seen some really beautiful classic double stocks with it however there has been lot's of information on the internet about it since the information age. Here's a small blurb from hundreds you can read on the internet about the subject. I'll not debate the fact it is a classic finish and looks good intially but it darkens with age.
WHAT TYPE OF FINISH?
The strongest finish against bumps and bruises is a two-part epoxy like Fullerplast which was used on Weatherby guns. It is a one-coat finish but quite thick and not classy looking. The same is true of the plastic Urethane finishes. Wax is an adequate finish on exotic woods with extremely high oil content. Most finishes will not permanently stick to these finishes although Fullerplast seems to work well on them. For oil finishes, the old standard was Linseed oil which is, frankly, a horrible product. It darkens with age and hides the beauty of finely figured wood. It does not adequately harden and does a very poor job of protecting the wood from moisture. It gives only 1/3 the moisture intrusion protection of Tru-Oil. The age old advise is to apply a coat a day for a week, a coat a week for a month, a coat a month for a year, and a coat a year FOREVER! I hate Tung oil even worse than Linseed oil. It must be applied in extremely small amounts and let completely dry for a long time before any more is added over it. Otherwise, it will turn from a seemingly hard finish to a sticky mess when the weather warms up. My favorite is Tru-Oil (the favorite of the Italian gunmakers). It is a Tru-Oil (the favorite of the Italian gunmakers). It is a plastic with the properties of oil. . It dries quickly, provides excellent moisture protection, gives a classic thin and beautiful finish, and can be finished either matte or satin. Please never use stain or filler. It looks like crap, ruins the look of fine wood, and is difficult to refinish.