.300 Whisper - .300/221 - .300Fireball

[blboyd]

<span style="font-weight: bold"><span style="font-style: italic"><span style="font-size: 20pt">.300 Whisper</span></span></span>

There doesn't seem to be a thread dedicated to the .300 Whisper or .300-221 or .300 Fireball.

I've been playing with my Whisper more and more lately. Trying to get a hunting load. I don't have a can so the subsonics don't offer me a lot. Hopefully this data will help someone find the load they need. BTW - The new Sierra manual has great Whisper data in the <span style="font-style: italic">Single-Shot Pistol</span> section.

<span style="font-weight: bold">WEAPON INFO</span>
<div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre>
Custom Build AR15
16" 1/8 Barrel
Carbine Gas System
.223Rem cases cut and resized to .300 Whisper using Redding dies.
Standard bolt and carrier
Standard weight buffer
</pre></div></div>


<span style="font-weight: bold">SUPERSONIC DATA</span>
<div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre>
Bullet: 180gr Nosler Ballistic Tip
Powder: Military Surplus WC820(Comparable AA#9)
OAL: 2.245"
12.5gr - 1462fps
13.0gr - 1524fps
13.5gr - 1539fps
14.0gr - 1590fps
Notes: Cycled action - no signs of pressure
</pre></div></div>
<div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre>
Bullet: Hornady 110VMax
Powder: Military Surplus WC820(Comparable AA#9)
OAL: 2.055"
17.2gr - 2212fps
17.5gr - 2294fps
Notes: Cycled action - no signs of pressure
</pre></div></div>
<div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre>
Bullet: Hornady 165gr Interbond
Powder: Military Surplus WC820(Comparable AA#9)
OAL: 2.220"
14.7gr - 1795fps
Notes: Cycled action - TOO HOT! - Lost a primer
</pre></div></div>
<div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre>
Bullet: Speer 165gr Deep-Shok
Powder: Military Surplus WC820(Comparable AA#9)
OAL: 2.200"
13.8gr - 1673fps
14.2gr - 1687fps
14.5gr - 1736fps
Notes: Cycled action - No signs of pressure
</pre></div></div>


<span style="font-weight: bold">SUBSONIC DATA</span>
<div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre>
Bullet: Sierra 220gr HPBT Matchking
Powder: Military Surplus WC820(Comparable AA#9)
OAL: 2.250"
8.0gr - 819fps
8.2gr - 843fps
8.5gr - 831fps
9.0gr - 914fps
10.0gr - 1065fps
11.0gr - 1210fps - +P
11.5gr - 1299fps - +P
12.0gr - 1360fps - Lost Primer
12.5gr - Didn't even try
Notes: Never cycled action - No signs of pressure going subsonic
</pre></div></div>


<span style="font-weight: bold">ENJOY!</span>
Whisper