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RCBS
The RCBS Full Length Die Set for 300 Remington Short Ultra Magnum (300 RSUM) is a two-die reloading set purpose-built for handloaders working with bottleneck magnum cases. Whether you're loading ammo for long-range hunting, precision rifle competition, or building a dependable supply for your 300 RSUM, this set gives you the dies needed to resize, deprime, and seat bullets to consistent SAAMI specifications.
The Full-Length Sizer Die is where case prep begins. It brings fired cases back to minimum SAAMI cartridge dimensions, resizing the case body and neck while decapping the spent primer in one pass. Engineered vents prevent air traps and excessive lubricant buildup that can damage cases during sizing—a detail that matters when you're working with premium magnum brass. Headspace is held tight at minimum tolerances, so the die won't inadvertently change case body length, which is critical for maintaining consistent chamber fit and performance shot to shot.
The included Seater Die handles the final step: seating your bullet and crimping the case neck simultaneously with its built-in roll crimper. This combined operation keeps your rounds secure and uniform, reducing the variables that hurt accuracy and reliability downrange.
| Cartridge | 300 Remington Short Ultra Magnum (300 RSUM) |
| Dies Included | 2 (Full-Length Sizer Die, Seater Die) |
| Case Type | Bottleneck |
| Sizer Die Features | Expander-Decapping Unit, Vent Holes, Minimum Headspace Tolerance |
| Seater Die Features | Bullet Seater Plug, Built-in Roll Crimper |
The set includes two dies: a Full-Length Sizer Die with an integrated expander-decapper unit, and a Seater Die with a built-in roll crimper and bullet seater plug.
No. These dies are sized and configured specifically for the 300 Remington Short Ultra Magnum. Using them for any other cartridge will not produce safe, accurate ammunition.
The built-in roll crimper in the seater die secures the bullet in the case neck as you seat it, creating a uniform crimp that holds the bullet firmly in place and helps maintain consistent bullet-to-case contact.
The vent holes in the sizer die prevent trapped air and excess lubricant from building up inside the die during the sizing stroke. This reduces the risk of case damage and ensures more consistent sizing results.
RCBS
The RCBS Full Length Die Set for 300 Remington Short Ultra Magnum (300 RSUM) is a two-die reloading set purpose-built for handloaders working with bottleneck magnum cases. Whether you're loading ammo for long-range hunting, precision rifle competition, or building a dependable supply for your 300 RSUM, this set gives you the dies needed to resize, deprime, and seat bullets to consistent SAAMI specifications.
The Full-Length Sizer Die is where case prep begins. It brings fired cases back to minimum SAAMI cartridge dimensions, resizing the case body and neck while decapping the spent primer in one pass. Engineered vents prevent air traps and excessive lubricant buildup that can damage cases during sizing—a detail that matters when you're working with premium magnum brass. Headspace is held tight at minimum tolerances, so the die won't inadvertently change case body length, which is critical for maintaining consistent chamber fit and performance shot to shot.
The included Seater Die handles the final step: seating your bullet and crimping the case neck simultaneously with its built-in roll crimper. This combined operation keeps your rounds secure and uniform, reducing the variables that hurt accuracy and reliability downrange.
| Cartridge | 300 Remington Short Ultra Magnum (300 RSUM) |
| Dies Included | 2 (Full-Length Sizer Die, Seater Die) |
| Case Type | Bottleneck |
| Sizer Die Features | Expander-Decapping Unit, Vent Holes, Minimum Headspace Tolerance |
| Seater Die Features | Bullet Seater Plug, Built-in Roll Crimper |
The set includes two dies: a Full-Length Sizer Die with an integrated expander-decapper unit, and a Seater Die with a built-in roll crimper and bullet seater plug.
No. These dies are sized and configured specifically for the 300 Remington Short Ultra Magnum. Using them for any other cartridge will not produce safe, accurate ammunition.
The built-in roll crimper in the seater die secures the bullet in the case neck as you seat it, creating a uniform crimp that holds the bullet firmly in place and helps maintain consistent bullet-to-case contact.
The vent holes in the sizer die prevent trapped air and excess lubricant from building up inside the die during the sizing stroke. This reduces the risk of case damage and ensures more consistent sizing results.
