MAGNITUDE SMOOTH GRAND SLAM
THREE-QUARTER HEAVY LINE
Three Targets. One Line. Zero Compromises.
The SA Magnitude Smooth Grand Slam is your go-to fly line when you’re chasing permit, bonefish, and tarpon—and you don’t have time to swap spools. Built slightly overweighted to load fast-action saltwater rods quickly, this line is engineered for power, precision, and stealth in the harshest flats environments.
Featuring the latest Magnitude coating, it offers unmatched durability, tropical heat resistance, and reduced friction. The smooth finish means no textured “zing”, making it a quieter option with superior line control for delicate presentations when it counts.
| Specification | Detail |
|---|---|
| Weight | Three-quarter heavy |
| Coating | Magnitude coating |
| Use Case | Permit, bonefish, tarpon |
| Performance | Power, precision, stealth |
FAQ
What makes the Magnitude Smooth Grand Slam different from other fly lines?
It features a Magnitude coating that provides superior durability and tropical heat resistance, along with a smooth finish that reduces friction and eliminates a textured ‘zing’, offering better line control and quietness during delicate presentations.
Is this line suitable for fast-action saltwater rods?
Yes, it is specifically designed to load fast-action saltwater rods quickly, making it ideal for use with rods that require rapid and precise casting.
Can this line be used in hot tropical conditions?
Yes, the Magnitude coating provides excellent tropical heat resistance, ensuring performance remains stable in high-temperature environments.


Rebecca Lawrence –
Used this line on bonefish and tarpon in the Florida flats. It loads smoothly on my fast-action rod and feels very quiet in the water. The coating holds up well even after several days of sun exposure. No fraying or stiffness, which is a big plus.
Diana Ball –
Great for when I need to switch between permit and bonefish without changing lines. The smooth finish makes casting feel more natural and helps with subtle presentations. Holds up well in heat and doesn’t snag easily.
Nicholas Arnold –
Solid performance in saltwater flats. A bit heavier than expected, but that helps with rod loading. The line doesn’t feel slippery or noisy during casts. Would recommend for anglers targeting larger species.
Zoe Rampling –
Perfect for my daily trips to the mangroves. The durability and resistance to heat are noticeable. I’ve used it for over a week in direct sun and it still looks and performs like new.