can handle 3D line of the same taper in rather wide grain window. If you use more pure underhand cast and like faster tempo Rio
480 gr F-H-I ( thy call it F-H-S2) but it is really fast intermediate or I-F-S3 ( 480gr) is great. The heads are closer to 485-490 gr and 35’ long. On F-H-I or I-H-S3 fluorcarbon leader which sink around 1.5’/sec is a great combination.
With fluorocarbon material you can use shorter leader like 9-10 ‘,
but when casting a larger flies, as short as 6.5’ will yield a quite decent cast. Also with heavier flies ( NOT DEAD RAT…!!!) like on the photo, in 3” range and total weigh 0.8 gram, excluding trailing hook like Owner size 1 ( 0.3 gram weigh), either of 480 gr Rio head will deliver a fly with authority
When Using H-I-S3, you can even use 3 foot strong tippet 20 lb fluoro Seaguar , which has the real diameter equal to 15 lb Maxima.
It is very easy to build your own core Fluoro leader finished with a small Krefty loop and just add 30-35” tippet with a fly.
If you want more authority, use Nexcast SF45.
NC SF45 head of 550 gr plus 80 gr tip is way to heavy for CFB 8134-4, unless you want to feel it as a Skagit Head.
All SF45 have the same taper section ( the entire Int. and the front floating), and the only difference is leveled rear belly. For that reason the best is to start with 510 gr body, add 10’ 80 gr tip like Rio
Type 3 or 6. If the set up feels to heavy, just prune the head form the back in 6 inch increments, tie a temporary mono loop and test it with the real fly.
Once you are generally satisfy, weld to the head polyurethane loop form 50 lb Airflo RL or old Airflo Delta ( the best) and fish for few days before trying to cut it more.
Another nice combination is to use Rio
Intermediate Scandi body 400 gr with Type 3 or 6 , 15; tip wt.8 ( 108 gr). If it is to long for you , cut the tip. I prefer to cut the tip from the back to preserve 3 foot front taper .