Been looking and would like to know what other crew are able to run as a smallest size on a 520 . I dont really want to buy a 490 if I can help it . Or I guess largest sail on a 460 Fiberpsar R5000 or North Platinum 460 .
want something between loft 7.4 and Severne ssr10m
thanks for any help .

I had an arrows 9.2 that fit on a 520 mast, with 20 extension ! But it was pretty old, I guess about 10 years.

as i am a Maui Sails fan ...
some of the "older" 9.x sails fit on a 520
my understanding is that Severne masts are close to MS
in 2010 the Titan 9-oh and TR-6 9.2 both went on a 520
however, is it worth going from a 10-oh to a 9.x ???

what you may want to look for is an 8.x that fits on a 460
and your 460 masts are Fiberspar and North - both constant curve??
or, some people actually use carbon mast extensions of 30 cm
not so sure how i feel about that, butt is an option ...

good luck with that