close cart icon/nav/menu-X Bag (0)

view
$50

MC-40 Fly Line

$69
SAVE 15% In Cart!
SALE
Montana Casting Co. MC-40 Fly Line 1
Montana Casting Co. MC-40 Fly Line 2
Montana Casting Co. MC-40 Fly Line 3

MC-40 Fly Line

$69
SAVE 15% In Cart!

Wind. Whenever possible, we try to avoid it. Fortunately, our MC-40 fly line has no such aversions. Details & Specs

SizeMC-404 (4 wt)
SAVE 15% In Cart!
  • Available in 4-10 wt
  • See product specifications for more information 
  • MC-40 Fly Fishing Line Specifications

    An extra 10ft of taper adds 50 grain to the front of this energetic, long-distance line. The wind won’t stand a chance. Features welded loops at both ends for easy attachment to backing and leader. Adheres to AFFTA specs.

     




    Montana Casting Co. MC-40 Fly Line Specification Table


    Though this product was designed for freshwater use, it can be used in saltwater. To prevent corrosion, always remember to wash your gear with freshwater after a hard day of fishing in the salt.

  • Compare Our Fly Lines

    MC-30 Fly Line
    MC-30 Fly Line
    MC-38 Fly Line
    MC-38 Fly Line
    MC-40 Fly Line
    MC-40 Fly Line
    Available Sizes

    4 wt - 10 wt

    4 wt - 9 wt

    4 wt - 9 wt

    Taper

    Taper contained in 
    first 30 ft

    Taper contained in 
    first 38 ft

    Taper contained in 
    first 40 ft

    Weight in Grains/Grams

    4 wt

    5 wt

    6 wt

    7 wt

    8 wt

    9 wt


    149 gr / 9.7 g
    173 gr / 11.2 g
    189 gr / 12.3 g
    224 gr / 14.5 g
    245 gr / 15.8 g
    307 gr / 19.8 g


    130 gr / 8.4 g
    150 gr / 10.0 g
    171 gr / 11.1 g
    188 gr / 12.2 g
    222 gr / 14.4 g
    252 gr / 16.4 g


    120 gr / 7.8 g
    140 gr / 9.0 g
    163 gr / 10.5 g
    182 gr / 11.8 g
    204 gr / 13.2 g
    235 gr / 15.2 g

    Where we like to fish with it...

    Brushy, overhanging banks
    Beaverhead R. & Gallatin R.
    Yellowstone & Glacier Parks

    Madison, Yellowstone & Missouri, Mountain lakes 
    (cutthroat, grayling)

    Hebgen & Canyon Ferry Lakes, Large Rivers
    Long casts in windy conditions 

    Our go-to for...

    Large nymphs & roll casting

    Light nymphs; dry flies
    Long casts in med/big waters

    Long distance casting, windy conditions

    View MC-30 View MC-38 View MC-40
  • Fly Fishing Knots To Use With Your Fly Line

    How To Tie A Nail Knot

    How To Tie A Nail Knot

    Scott demonstrates using a nail knot tool to attach a length of butt section to a fly line.

    Learn How

    How To Tie A Perfection Loop

    How To Tie A Perfection Loop

    Learn how to tie a perfection loop in less than a minute in this easy-to-follow video.

    Learn How

MC-40 Fly Fishing Line Specifications

An extra 10ft of taper adds 50 grain to the front of this energetic, long-distance line. The wind won’t stand a chance. Features welded loops at both ends for easy attachment to backing and leader. Adheres to AFFTA specs.

 




Montana Casting Co. MC-40 Fly Line Specification Table


Though this product was designed for freshwater use, it can be used in saltwater. To prevent corrosion, always remember to wash your gear with freshwater after a hard day of fishing in the salt.

Compare Our Fly Lines

MC-30 Fly Line
MC-30 Fly Line
MC-38 Fly Line
MC-38 Fly Line
MC-40 Fly Line
MC-40 Fly Line
Available Sizes

4 wt - 10 wt

4 wt - 9 wt

4 wt - 9 wt

Taper

Taper contained in 
first 30 ft

Taper contained in 
first 38 ft

Taper contained in 
first 40 ft

Weight in Grains/Grams

4 wt

5 wt

6 wt

7 wt

8 wt

9 wt


149 gr / 9.7 g
173 gr / 11.2 g
189 gr / 12.3 g
224 gr / 14.5 g
245 gr / 15.8 g
307 gr / 19.8 g


130 gr / 8.4 g
150 gr / 10.0 g
171 gr / 11.1 g
188 gr / 12.2 g
222 gr / 14.4 g
252 gr / 16.4 g


120 gr / 7.8 g
140 gr / 9.0 g
163 gr / 10.5 g
182 gr / 11.8 g
204 gr / 13.2 g
235 gr / 15.2 g

Where we like to fish with it...

Brushy, overhanging banks
Beaverhead R. & Gallatin R.
Yellowstone & Glacier Parks

Madison, Yellowstone & Missouri, Mountain lakes 
(cutthroat, grayling)

Hebgen & Canyon Ferry Lakes, Large Rivers
Long casts in windy conditions 

Our go-to for...

Large nymphs & roll casting

Light nymphs; dry flies
Long casts in med/big waters

Long distance casting, windy conditions

View MC-30 View MC-38 View MC-40
MC-30 Fly Line
MC-30 Fly Line
Available Sizes

4 wt - 10 wt

Taper

Taper contained in 
first 30 ft

Weight in Grains/Grams

4 wt

5 wt

6 wt

7 wt

8 wt

9 wt


149 gr / 9.7 g
173 gr / 11.2 g
189 gr / 12.3 g
224 gr / 14.5 g
245 gr / 15.8 g
307 gr / 19.8 g

Where we like to fish with it...

Brushy, overhanging banks
Beaverhead R. & Gallatin R.
Yellowstone & Glacier Parks

Our go-to for...

Large nymphs & roll casting

View MC-30
MC-38 Fly Line
MC-38 Fly Line
Available Sizes

4 wt - 9 wt

Taper

Taper contained in 
first 38 ft

Weight in Grains/Grams

4 wt

5 wt

6 wt

7 wt

8 wt

9 wt


130 gr / 8.4 g
150 gr / 10.0 g
171 gr / 11.1 g
188 gr / 12.2 g
222 gr / 14.4 g
252 gr / 16.4 g

Where we like to fish with it...

Madison, Yellowstone & Missouri, Mountain lakes 
(cutthroat, grayling)

Our go-to for...

Light nymphs; dry flies
Long casts in med/big waters

View MC-38
MC-40 Fly Line
MC-40 Fly Line
Available Sizes

4 wt - 9 wt

Taper

Taper contained in 
first 40 ft

Weight in Grains/Grams

4 wt

5 wt

6 wt

7 wt

8 wt

9 wt


120 gr / 7.8 g
140 gr / 9.0 g
163 gr / 10.5 g
182 gr / 11.8 g
204 gr / 13.2 g
235 gr / 15.2 g

Where we like to fish with it...

Hebgen & Canyon Ferry Lakes, Large Rivers
Long casts in windy conditions 

Our go-to for...

Long distance casting, windy conditions

View MC-40

Fly Fishing Knots To Use With Your Fly Line

How To Tie A Nail Knot

How To Tie A Nail Knot

Scott demonstrates using a nail knot tool to attach a length of butt section to a fly line.

Learn How

How To Tie A Perfection Loop

How To Tie A Perfection Loop

Learn how to tie a perfection loop in less than a minute in this easy-to-follow video.

Learn How


Gear Durability Testers may not make the best leaders - Squirrel!! - but Montana Casting Co.<sup>®</sup> sure does!

Gear Durability Testers may not make the best leaders - Squirrel!! - but Montana Casting Co.® sure does!

Shop Leaders


Our Return Policy

To be eligible for a return on merchandise other than rods and reels, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. Certain types of items cannot be returned (such as custom rods or custom rod packages, open packages of leaders, tippet or backing, and seconds). Additionally, rods and reels are covered by our 30-Day Satisfaction Guarantee (details in our full return policy - see link below). Please get in touch if you have questions or concerns about your specific item. We do not accept returns for gift cards or on-sale items, unless the item is damaged or defective.

Read full Return Policy

You May Also Like…

Lite 406 Fly Fishing Reel - Lite 406 Frame Side Lite 406 Fly Fishing Reel - Lite 406 Frame Side
SALE
Lite 406
Fly Fishing Reel
$269.00
SAVE 15% In Cart!
Shop Now
Fly Rod - Dearborn 2 & 4 Piece Fly Rod - Dearborn 2 & 4 Piece
SALE
Dearborn Fly Rod
2 & 4 Piece
$650.00
SAVE 15% In Cart!
Shop Now
Emerger Fluorocarbon Tippet
SALE
Emerger Fluoro Tippet
$13.99
SAVE 15% In Cart!
Shop Now
Fly Fishing Reel - Montana Casting Co. Elite 406 Fly Fishing Reel - Montana Casting Co. Elite 406
SALE
Elite 406
Fly Fishing Reel
$375.00
SAVE 15% In Cart!
Shop Now
Lite 406 Fly Fishing Reel - Lite 406 Frame Side Lite 406 Fly Fishing Reel - Lite 406 Frame Side
SALE
Lite 406
Fly Fishing Reel
$269.00
SAVE 15% In Cart!
Shop Now
Fly Rod - Dearborn 2 & 4 Piece Fly Rod - Dearborn 2 & 4 Piece
SALE
Dearborn Fly Rod
2 & 4 Piece
$650.00
SAVE 15% In Cart!
Shop Now
Emerger Fluorocarbon Tippet
SALE
Emerger Fluoro Tippet
$13.99
SAVE 15% In Cart!
Shop Now
Fly Fishing Reel - Montana Casting Co. Elite 406 Fly Fishing Reel - Montana Casting Co. Elite 406
SALE
Elite 406
Fly Fishing Reel
$375.00
SAVE 15% In Cart!
Shop Now