FYI, "boiled" linseed oil is the kind I use for any wood-finish applications.
"Boiled" linseed oil (which, I understand, can also be made by adding chemicals to linseed oil, and not necessarily by boiling--though boiling works, too, obviously) dries out and hardens over the course of a couple of days into a transparent finish; it's also somewhat adhesive, somewhat seals the wood, and thus, for example, helps hold hammer and hatchet heads onto wooden handles. (One trick I've used in fitting handles to hammer-heads is to soak the head end of the handle in boiled linseed oil immediately prior to installing the handle in the head; the oil is slippery at first, but then after a few days becomes more like a tacky glue--meanwhile somewhat sealing the wood, and probably preventing shrinkage.) I've never had to make "boiled" linseed oil--usually that's just the kind I find at, for example, Home Depot.
It is my understanding that unboiled linseed oil either does not dry, or takes much, much longer to do so. I would thus avoid using it for things like 'hawk finish, setting handles into heads, etc.