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Home > Shooting Gear > Ammunition > Centerfire Rifle Ammunition > 300 AAC Blackout And Whisper
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300 AAC Blackout And Whisper

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300 AAC Blackout And Whisper Ammunition

The .300 Whisper is a wildcat cartridge in the Whisper family, a group of cartridges developed in the early 1990s by J.D. Jones of SSK Industries. It was developed as a multi-purpose cartridge, capable of utilizing relatively lightweight bullets at supersonic velocities as well as heavier bullets (200–250 grains) at subsonic velocities.

.300 Whisper is also sometimes known as .300 Fireball or .300-221, but there is some variation in dimensions and pressure between these cartridges.  Some implementations of .300 Whisper meet the SAAMI specifications for 300 AAC Blackout.

The .300 Whisper was originally based on the .221 Fireball case necked up to .30 caliber. However, avid reloaders have found the .223 Remington or 5.56×45 mm NATO works well when shortened and resized to .30 caliber. Firing in the .300 Whisper chamber results in a slightly sharper shoulder. Magnum pistol powders such as H110 work well for supersonic loads. Sierra 240 grain (16 g) jacketed bullets work well if the barrel has a 1:8 twist. Barrels with a 1:10 twist will stabilize 220 grain (14 g) bullets at subsonic speeds. 125 grain (8 g) bullets will reach 2400 ft/s (730 m/s).

There are a few points to be considered regarding the utility of the .300 Whisper:

  1. Supersonic loads are capable of matching ballistics of the 7.62x39mm and the .30-30 Winchester, making the .300 Whisper very capable as a short range deer hunting cartridge.
  2. The use of heavy bullets, along with the low powder weight and small case capacity, make the .300 Whisper ideal for use with sound suppressors. These subsonic loads offer energy levels similar to that of the popular .45 ACP pistol cartridge, but range is substantially increased due to the longer, more efficient .30 caliber bullet.
  3. Cases for the .300 Whisper can be formed from common and plentiful .223 Remington brass by sizing and trimming to length. However, J.D. Jones has recommended against this, citing the difference in case thickness at the neck (compared to the .221 Fireball) as a potential issue. This problem can be exacerbated when military 5.56x45mm cases are used. (The Whisper name is trademarked thus: the only firearms with a .300 Whisper chamber are those from J.D. Jones and Thompson Center, which licensed the name. All other guns are cut to .300/221 which has different chamber specifications than the Whisper, particularly in neck wall thickness. Because the .300 Whisper is a wildcat cartridge there were no establishedSporting Arms and Ammunition Manufacturers' Institute (SAAMI) specifications for the chamber reamers, and the necks were cut to allow for standard .308 neck thickness, which is approximately the same thickness as produced from forming .223 brass. Typically only guns with Whisper chambers will have problems with .223 brass—.300/221 chambers work very well with .223 brass, and the .223 brass is considerably stronger than .221 brass.)
  4. Perhaps most importantly, any firearm with a .223 Remington bolt face can be converted to .300 Whisper by re-barreling the action. As such, the .300 Whisper works well in AR-15–based rifles, especially when some type of gas regulator is installed.

In addition to special applications in suppressed firearms, the .300 Whisper has become popular with metallic silhouette shooters due to its low recoil, good long range performance, and very high accuracy.

Products

Hornady 300 Whisper 208 Gr AMAX
Hornady 300 Whisper 208 Gr AMAX
$24.28
Hornady 300 Whisper 110 Gr V  Max
Hornady 300 Whisper 110 Gr V Max
$21.39
Remington 300AAC Blackout 125gr Ammunition Per 20
Remington 300AAC Blackout 125gr Ammunition Per 20
$26.32
Nosler 300 AAC Blackout 110gr FB Tipped  20 ct.
Nosler 300 AAC Blackout 110gr FB Tipped 20 ct.
$27.46
PNW Arms 300 BlackOut 147gr FMJ Bulk Ammunition Per 200
PNW Arms 300 BlackOut 147gr FMJ Bulk Ammunition Per 200
$133.34
Nosler 300 AAC Blackout 125gr Ballistic Tip Ammunition Per 20
Nosler 300 AAC Blackout 125gr Ballistic Tip Ammunition Per 20
$28.82
PNW Arms 300 BlackOut 125gr Nslr Ball.Tp HPBT Ammunition Per 20
PNW Arms 300 BlackOut 125gr Nslr Ball.Tp HPBT Ammunition Per 20
$0.00
PNW Arms 300 BlackOut 147gr FMJ Ammunition Per 20
PNW Arms 300 BlackOut 147gr FMJ Ammunition Per 20
$11.49
Barnes Bullets 21548 300 AAC Blackout TTSX FB VOR  TX Ammunition Per 20
Barnes Bullets 21548 300 AAC Blackout TTSX FB VOR TX Ammunition Per 20
$30.06
Nosler 300  Black 220gr Custom Competition Ammunition Per 20
Nosler 300 Black 220gr Custom Competition Ammunition Per 20
$26.76
Federal Cartridge 300BO Subsonic 220gr Ammunition Per 20
Federal Cartridge 300BO Subsonic 220gr Ammunition Per 20
$22.95
Dynamic Research Technologies 300  Black 147gr FMJ Ammunition Per 200
Dynamic Research Technologies 300 Black 147gr FMJ Ammunition Per 200
$144.07

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