We use 250' of chain with a 50' tail of three-strand rope-chain. We have a 33,000# or so cruising displacement
. (65# CQR)
If you look at the load's -- unless you're hooked to rock (or God forbid, coral) -- I would think that the rope
to chain splice should be a lot stronger than the anchor-to-bottom connection -- or your bow cleat, for that matter.
I would take the length of chain that you would normally use for deepest water
thay you would generally expect to be anchoring
(i.e., as though you aren't going likely to use your line at all); then I'd add a "tail" for that time when you really are going to let all the scope
out. Than you won't have to mess with a snubbe in those conditions -- a snubber may get in the way on that dark and stormy.
I've only had the rope
out a couple of times (in about 30'-35' of water
in a bit of blow) -- I had the room in the anchorage and probably would have been fine. (Once in Great Salt
Pond when they said the wind
would be above 40 knots with higher gusts. It was a night in which there weren't many other boats in the anchorage, we didn't have much in the way of waves.-- as opposed to some of the "Islands" that others deal with in the Carribean.)