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300 Whisper

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The .300 Whisper is a specialized rifle cartridge designed by J.D. Jones of SSK Industries in the early 1990s. It is notable for its versatility in various shooting applications, particularly in subsonic and supersonic performance.
Key Features:
1. Design and Development: Created for use in both AR-15-type rifles and bolt-action rifles, the .300 Whisper is based on a necked-up and fire-formed .221 Remington Fireball case.
2. Bullet Types: It can be loaded with a wide range of bullet weights, typically ranging from 110 grains to 250 grains, making it adaptable for different purposes.
3. Subsonic Performance: When loaded with heavy bullets (e.g., 220-240 grains), the .300 Whisper can be fired at subsonic velocities (~1,050 feet per second), making it ideal for use with suppressors, significantly reducing noise.
4. Supersonic Capability: It can also be loaded with lighter bullets to achieve supersonic velocities, suitable for longer-range shooting and higher terminal performance.
5. Use Cases: Its quiet operation with subsonic ammo makes it popular in tactical applications, hunting (especially with suppressors), and specialized shooting competitions.
However, it is worth noting that the .300 Whisper requires careful handloading to achieve its full potential due to its versatility.


Die Sets
Lee Collet Necksizing 2-Die Set
Lee RGB Die Set
Lee Full-Length Sizing Die Set
Lee Breech Lock Die Set
Lee Ultimate 4-Die Set
Lee Loader
Single Dies
Full-Length Sizing Die
Sizing Die
Neck Sizing Die
Undersize Sizing Die
Charging Die
Seating Die
Factory Crimp Die
Taper Crimp Die
Inline Bullet Feed Die
Case Conditioning Tools
Case Length Gauge and Shell Holder
90493
Quick Trim Die
Presses
Reloader Press (50 RPH)
Hand Press (50 RPH)
Challenger Press (50 RPH)
Classic Cast Press (50 RPH)
Value Turret Press (250 RPH)
Classic Turret Press (250 RPH)
Ultimate Turret Press (250 RPH)
Pro 1000 Press (500+ RPH)
Pro 4000 Press (500+ RPH)
Six Pack Pro Press (500+ RPH)
Shell Plates and Holders
Priming Tool Shell Holder
90204 (#4)
Universal Press Shell Holder
90521 (R4)
X-Press Shell Holder (APP)
91537 (#4)
Pro 1000 Shell Plate
Auto Breech | Pro 4000 Shell Plate
90630 (4)
Six Pack Pro Shell Plate
91838 (4S)
Inline Bullet Feed
Inline Bullet Feed Die
Inline Bullet Feed Kit
Inline Bullet Feed Magazine
Bullet Casting
Classic Bullet Sizing Kit
Breech Lock Bullet Sizer and Punch
Bullet Molds

Micrometer Adjust Screw

From $20.00

Power Grip Shell Holder

92149
$10.00

Challenger III

From $117.00

Ultimate Turret Press

From $320.00

Deluxe APP Press Kit

91898

Includes:

  • Press
  • Roller Handle
  • Priming System
  • Universal Case Feeder
  • APP Deprime Kit
  • Bottle Adapter
$155.00

Six Pack Pro Press

From $400.00