Sink tip line weight for 9' 10wt St. Croix Legend Elite

[srm413]

Need to buy a new sink tip for my son-in-laws 10wt st. croix rod.  he likes/wants a rio striper line, but the question is....350gr or 400gr?  i use a 350gr on my 9wts.

[bloosfisher]

If he throws larger flies, get the 400.  

[surfrat59]

I'd take the 350gn you currently own and cast it with his 10wt for awhile and decide if it would benefit from the heavier line. 

[jtwfish]

I use a 350 grain on my 10 wt and it fires out the line. I also have a 400 grain that slows down the rod line speed and opens the loop. I;m using an older 10wt Temple Fork Pro.

I have tried a 450 grain sink head that is just way too much.

If you can try the rod with the line as suggested AND  the usual size fly that would be a good way to go.

[Killiefish]

Unless your 10wt St Croix has a very stiff tip it may struggle with 400g, and the risk of breakage with a high modulus rod goes way up if you overload it.

[JRT]

Another vote for the 350gr. I use them on my 10wt Orvis Recon and Hardy Zephrus and they cast fine. You can always add a couple of feet of T8/T10 to add weight or a heavier fly.