You could use a 10mm (3/8") G70 chain approx 22,000lb to bust it so way stronger than a matching anchor
will hold. 2.3kg/mt whatever that is on that old school
imperial system. But it would be lite, as in physical weight, so if the weather
went bad the mantra would be scope
and then use more scope.
Around a 100-125lb Supreme... or Rocna
, they do perform identically so buy whichever you can find the cheapest. Be aware the physical size of these beasts, it does catch more than a few out.
Secondary system. A big Fortress
which will save weight and give you a better anchor for the soft type bottoms. Boat length of chain and a nice long length of polyester line which you set up to shackle onto the chain, which will mean you have a nice long line you can used to tie aft in somewhere, tow line or just for whatever. Thinking 'multi purpose' there as many hardly ever use their secondary in vengeance. Polyester as it stays nicer longer than Nylon will, has the same strength and is becoming cheaper... or was until the damn Future Traders found out the Bangladesh cotton crop got drowned and drove the raw price
up 25% in 6 weeks.... Grrrrrrrrr
Don't suppose you have a bit more info on the boat do you? Just how fine are the bows, which often indicates how she will handle weight up that end. I'm guessing on something like that the anchor locker
will be back by the mast