Your Armory - Try our new product search tool!

All Categories

    Custom Large Series Collet Necksizing Die Set (1 1/4x12" Thread)


    Custom Collet Die set consists of the Collet Neck sizing die 1 1/4x12" (large series) thread, the easy adjust dead length bullet seating die.

    SKU: 90743
    Manufacturer part number: 90743

    Send to:
    Lee Precision, Inc.
    4275 County Road U
    Hartford, WI 53027

    Availability: In stock

    Select the collet die set if using brass fired through your gun only. Custom Large Series Collet Die set consists of the Large Series Collet Neck sizing die, and the dead length bullet seating die.

    Please indicate required fields above. You will need a fired and sized piece of brass to measure. For assistance in determining the dimensions, please view this document. View cartridge listing for shell holder assignment, view list here.

    Case diameter at the base must be .581" up to .800".  Bullet diameter must be larger than .375" and maximum case length up to 4.00". Example cartridges: 378 Whby Mag, 338/378, 404 Jeffrey, 416 Rigby 577/450 Martini Henry, and 450 Bushmaster.

    There are a few exceptions for the larger Ultra Mags, if you are interested in those, you may want to give us a call or send a case to determine whether or not we can make them.

    The Collet Neck Sizing Die is not recommended for Auto Loaders, Slide or Lever Action Guns.

    These Large Series dies have 1 1/4x12" thread. Note: These Large Series Dies will only fit into our Classic Cast press, and some competitors larger presses. Large series dies can be made for cartridges ranging in size up to and including the 50 BMG.

    If you are interested in a custom Collet die set, send payment and two fired cases from the rifle that the ammunition is to be reloaded for, as well as a sample projectile . The cases are used to determine the dimensions of the dies to be made, the bullet is so we can test the dies before shipment. When ordering Custom dies, we match the configuration of your rifle chamber. The dies we make are hand made to match your chamber. Current lead time for a Custom Collet die set is around 10 weeks and begins once payment AND the required cases/projectiles are received.

    *Note to International Customers:  Due to newly enforced shipping regulations as of 2/6/18, we will NOT be able to return your cases or bullets to you.*‚Äč

    If you wish to place your order online with a credit card, contact us first so we can advise if the size you are looking for can be made, we will then give you the ordering link.

    Please send your two fired cases and sample projectile, along with your invoice/order ID to:

    Lee Precision, Inc.
    4275 Highway "U"
    Hartford, WI 53027

    Cartridges we can not make because they are either too short or we don't have a shell holder for: 

    • 5.7x28
    • 7x33 Sako
    • 7.65 Par
    • 7.82 Warbird
    • 7.92X33 Kura R
    • 8mm Nambu
    • 9.3X72
    • 11 mm French
    • 17 Mach IV
    • 17 Pee Wee or 17/5.7 Johnson
    • 19 Badger
    • 22 Rem Jet
    • 22 TCM
    • 25/20 Win
    • 30 M1 Carbine
    • 30 Luger
    • 32/20
    • 43 Spanish
    • 218 Bee
    • 256 Win Mag
    • 300 Whisper
    • 470 Nitro Express

    WarningWARNING: Handling live primers and spent primers may expose you to lead or other chemicals, which are known to the State of California to cause reproductive harm and cancer. For more information, go to


    WarningWARNING: Steel parts in this product may be alloyed with trace amounts of lead and other elements which are known to the State of California to cause reproductive harm and cancer. For more information, go to To prevent exposure, do not alter the product by welding, grinding, etc.