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Old October 29, 2002, 11:28 AM   #1
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subsonic 7.62x39 vs. 300 whisper...

for a supressed bolt action...

does one round have anything over the other? one more accurate than the other? (can they both use the same bullets for reloading?)

do either of them have enough "umpff" to take down medium sized game? (ie whitetail) and yes, i know you CAN kill deer with a 22lr...but i wouldnt recommend it...
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Old October 29, 2002, 01:43 PM   #2
Jim Watson
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Not exactly my field, just to kick things around...
A real Jones .300 Whisper has a 1 in 8" twist to stabilize 240 grain boattails at 1050 fps.
So what one guy of my acquaintance keeps threatening to build, a "Commie Whisper" would have to have similar. A standard 7.62 barrel with 10" or so twist would probably not stabilize the subsonic heavy bullet load. For best accuracy it would have to be bored and throated for .308" bullets. But I don't know if standard Commie surplus 7.62 would then shoot accurately and without excess pressure in it.
Ruger made some Mini 30s with .308" barrels, but they were made to let the .311" bullets swage to fit gradually in a long throat. Good for an "assault rifle" but I don't know how accurate it would be in a bolt action.
You can get 7.62x39 dies with two expanders for .308" and .311" bullets, so that is ok.

It looks to me like the only point of making it up in 7.62 would be cheaper brass and no necking up, which does not seem to be important in a custom gun with a $200 stamp. And the possiblilty of shooting factory loads if that was all you could get.

The 7.62x39 is just less powerful than a .30-30 and the .300 W supersonic is close. Ought to do for deer.
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Old October 29, 2002, 09:54 PM   #3
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If you don't care that much about wind drift, you _can_ stabilize heavier bullets in a longer twist, by using the shorter RN ones.

Twist and stabilization depends in part on the relative length of the bullet--which tends to follow weight.

I vote for some Chrono work using 7.62x39 in a .308 bore barrel and 220-gr RN flat-base bullets. Some .311 barrels will do okay with .308 jacketed, or so I've heard....
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Old October 29, 2002, 11:04 PM   #4
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Even with the 7.62x39 you would have to roll your own to get a subsonic load, which pretty much negates any ammo advantage. I don't know of any manufacture that makes a subsonic 7.62x39 load.

I do know that Corbon does make the .300 whisper loading in a subsonic and a moderate velocity load.

.300 whisper 150gr [email protected] fpsfor hunting, or for self defense a 125gr load at 2100 fps.

Cor Bon Ammo

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Old October 30, 2002, 08:59 AM   #5
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If you do want to roll your own and don't want to use .308 bullets, I think the .303 also uses .311 or .312 bullets. Ought to be some 200 or 220s availible there.
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