To get a reasonable amount of shock absorption with all-chain, use a
chain hook on about 30-40' ...

doesn't give all that much shock attenuation. much better is double triple
that amount of nylon. specs of rope manufactureres give nylon stretch at least
than about 4% (many writers/posters who didn't bother read the spec sheets talk
of 15% to 25% stretch, but the line won't go that except sometimes under
breaking conditions), except for special mountain climbing ropes and "plait".

... of light nylon laid line and veer out a few
more feet of chain.