Everyday wines

[flycaster10]

for years i have been under the impression that cabs are heavier/bolder than merlots. so i have explored the cab type.
this past weekend a friend told me that merlot is heavier than cabernet.
is that so?

also, can you provide a rule of thumb heavy to light scale for these wine/grape types.
zin>syrah>cab>merlot>pinot nior

thanks!