I made no claim a forend cap sealed all the end grain in a stock.I made no claim it was even effective.Somewhere along the way,maybe in a Rifle magazine or gunsmithing book ,who knows?A Ross Seifred article?I read that the horn forend cap was an attempt to seal the end grain.
The OP asked if anyone had ever heard of a functional reason,and I had come across that one.
Pardon me for trying to offer an answer.
Got a better one?
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