“The” Magnum Seating Die


Includes 2 seating stems

Model 1 Stem:  For 6mm , 25 Cal, 6.5mm, and 7mm Bullets

Model 2 Stem:  For 7mm and bigger bullets

SKU: N/A Categories: , , , Product ID: 17914


The Magnum Seating Die 

Available for body diameters of .535″(PRC’s), .550″ (SAUMS), and .555″ (WSM)

The magnum die is geared toward the body diameter of the cartridge you are shooting.  There are short and long action variations of each body size to accept the appropriate cartridges of both.  Please confirm prior to checking out.

Cartridges for .535″ Body diameter Short Action
  • 6mm PRC
  • 25 Cal PRC
  • 6.5mm PRC
  • 7mm PRC
  • 300 Ruger Compact Magnum
  • 338 Ruger Compact Magnum
Cartridges for .535″ Body Diameter Long Action
  • .257 Weatherby Magnum
  • 264 Winchester Magnum
  • 270 Weatherby Magnum
  • 7mm Remington Magnum
  • 7 LRM
  • 7 STW
  • 7mm Weatherby Magnum
  • 300 Winchester Magnum
  • 300 Weatherby Magnum
  • 300 PRC
  • 338 Winchester Magnum
  • 340 Weatherby Magnum
  • 350 Remington Magnum
  • 375 H&H Magnum
  • 375 Ruger
  • 416 Remington Magnum
  • 416 Ruger
  • 8mm Remington Magnum
Cartridges for .550″ Body diameter Short Action
  • .25 Cal SAUM
  • 6.5mm SAUM
  • 7mm SAUM
  • 300 SAUM
Cartridges for .550″ Body diameter Long Action
  • 26 Nosler
  • 27 Nosler
  • 7mm Remington Ultra Magnum
  • 28 Nosler
  • 30 Nosler
  • 300 Remington Ultra Magnum
  • 300 H&H Magnum
  • 33 Nosler
  • 338 Remington Ultra Magnum
  • 348 Winchester
  • 35 Nosler
  • 36 Nosler
  • 375 Remington Ultra Magnum
Cartridges for .556″ Body diameter Short Action

(Will not work with the 25 Winchester Super Short Magnum or alike)

  • .270 WSM
  • 7mm WSM
  • 300 WSM
  • 325 WSM

The Bullet Seating Die is designed to be the only bullet seating die you will ever need for a family of cartridge bodies. For example, with out purchasing any additional parts, you can easily and precisely seat bullets in any cartridge body, depending on your action length, which has a base diameter (.200″ above the bolt face) of .535″, .550″ or .556″.

Here is how The Bullet Seating Die works. The center bore of the die body is drilled and bored to ensure concentricity and parallelism to the bottom of the die and 7/8 x 14 threads. Next we precision ream the center bore for a perfect finish, lastly the hole is internally burnished for a mirror like surface finish while controlling the inside diameter to a tolerance of +/-.0002″.  This precision guide channel only has .001″ to .002″ total clearance around the base of the cartridge, properly locating the cartridge in the die body.

Next the spring loaded Cartridge Shoulder Sleeve and precision guided Bullet Seating Sleeve are held concentric and are guided by this precision cartridge bore in the die body. This ensures the absolute most concentric and true assembly.

Furthermore, we top off The Bullet Seating Die with a Mitutoyo Micrometer head which has .001″ graduations for a total travel of .500″ for the more precise bullet seating adjustments. Lastly, we incorporated a micrometer tension system to achieve a very positive feel when turning the micrometer head and prevent accidental movement.

The Magnum Seating Die can properly seat  6mm, 25 cal, 6.5mm, 7mm, 30cal. 338″, .375 Cal, etc. caliber bullets!

Bullet Seating Stems

Model 1 Stem:  For 6mm , 25 Cal, 6.5mm, and 7mm Bullets

Model 2 Stem:  For 7mm and bigger bullets


Additional information

Weight 16 oz
Dimensions 11 × 8 × 4 in
Action Length

Long, Short

Body Diameter

.535" (PRCs), .550" (SAUMs), .555" (WSMs)


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