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Posted: 9/22/2004 4:58:38 AM EDT
[Last Edit: 9/22/2004 5:02:29 AM EDT by Eclipse]
What are the overall benefits of the .300 Whisper caliber over 7.62x39mm? Trying to understand the merits of the .300 Whisper cartridge in an AR15 upper. Know it was developed as a sub-sonic round for military and law enforcement purposes. But why use .221 Fireball brass instead of the more commonly available .223 Remington?

Also since the ballistics are very similar, wouldn't it be possible to duplicate performance in the Russian 7.62x39mm caliber (assuming the barrel had a twist rate capable of stabilizing heavy .308 caliber bullets).

Most Colt barrels have a 1:12 twist in 7.62x39mm, how heavy bullets can be stabilized with this barrel?
Link Posted: 9/22/2004 6:43:47 AM EDT
It all depends on what you mean by 'benefit'. The 7.62x39 upper was created to benefit those who like cheap ammo. The 300 upper was created to benefit those who would like a suppressed upper using the standard AR platform.
Link Posted: 9/22/2004 6:48:33 AM EDT
[Last Edit: 9/22/2004 6:50:56 AM EDT by Rodent]
I have a suppressed .300 Whisper, and I do use .223 brass, although it must be cut down and necked up, of course. And if you don't care about the sonic boom, it can be loaded up to 7.62x39 levels.
Link Posted: 9/22/2004 9:22:13 AM EDT
You can feed 300 fireball in standard M16 mags; for x39 setups you need frankenmags or the AR47.
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