I'm assuming your talking about horn-to-wood in the context of a composite bow? For sure, don't use Gorilla glue...it expands and is NOT suited to highly stressed bow joints. Use Smooth-on, Urac, or similar. Titebond III would be the only adhesive available at said stores that I would use, but you need to a have perfectly flat and smooth mating surfaces to ensure a proper bond with it. Just my $0.02