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Author Topic:   Anyone Load 7.62x39 to Approach .300 FB Specs
CBB
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posted 03-23-2002 04:36 PM    Click Here to See the Profile for CBBClick here to email CBBEdit/Delete MessageSearch the Rifle Cartridges forumIP LoggedReply w/Quote
Has anyone worked up any loads for the 7.62x39 that are close to the sub-sonic
.300 FB (Whisper) specs. I am talking 220-240 grain BTHP over AA1680, Blue Dot, etc.
I don't even know if it is feasible. I just love my .300 FB, especially sub-sonic, and thought I would begin to play with the loadings of the 7.62x39.
The action is an AR15 with a 20" 7.62x39 barrel.
Any suggestions or warnings???
petie3
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posted 03-24-2002 01:15 AM    Click Here to See the Profile for petie3Click here to email petie3Edit/Delete MessageSearch the Rifle Cartridges forumIP LoggedReply w/Quote
I think BluDot would be ideal as it can be downloaded a bit and coupled with the heavier bullets would be subsonic. I would stay at 150 to 140 gr bullets and not to expect better than 3" groups in SKS or AKs.
Probably 2" with mini30s and 1.5 with bolts.
CBB
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posted 03-24-2002 09:32 PM    Click Here to See the Profile for CBBClick here to email CBBEdit/Delete MessageSearch the Rifle Cartridges forumIP LoggedReply w/Quote
I was hoping to get MOA or better at 100 yards as I do with my .300 FB. This will be shot from the same AR15 Lower. I am really looking to load up to the 220 grain Sierra
HPBT. I can't find any data on the 7.62x39 at that loading. I shoot approx 1020 fps in the .300 FB using 10.30gr of AA1680 or 8.20gr
of 2400. I would like to achieve the same in the 7.62x39.
Charley2
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posted 03-25-2002 09:54 PM    Click Here to See the Profile for Charley2Click here to email Charley2Edit/Delete MessageSearch the Rifle Cartridges forumIP LoggedReply w/Quote
CBB,
Check out this web page: http://www.accuratereloading.com/76239.html
Hope this helps.
CBB
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posted 03-25-2002 10:00 PM    Click Here to See the Profile for CBBClick here to email CBBEdit/Delete MessageSearch the Rifle Cartridges forumIP LoggedReply w/Quote
Thanks Charley, I been to that site...great data, but those are all super-sonic loadings. I still can't find a single one on the sub-sonic side of 1050 fps. Come on guys....someone must know where there is some data.
whitelitenin
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posted 08-19-2006 12:09 AM    Click Here to See the Profile for whiteliteninClick here to email whiteliteninEdit/Delete MessageSearch the Rifle Cartridges forumIP LoggedReply w/Quote
what is the FB?

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sedstar
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posted 08-19-2006 12:52 AM    Click Here to See the Profile for sedstarClick here to email sedstarEdit/Delete MessageSearch the Rifle Cartridges forumIP LoggedReply w/Quote
Hummm.....

I SEEM to recall SOMEone on here was once, a couple years ago... talkng about loading something medium-size 30-caliber to subsonic or near subsonic velocities, and it MIGHT have been 7.63x39.

His basic approach was VERY unorthodox, in my opinion, but he swore by it:

he was loading very heavy for caliber pills, maybe even cast, and putting them in the case BACKwards (yes, you read that right... putting the pill backwards in the case...)

he said he was "doing a real number" on coyotes stealing chickens late at night at close range and such. I dont recall he was cycling the action or not, but this basic approach would probably work on single shot loading.

as i recall, I had like one or two stars at the time that werent blinking, and he had like all stars blinking, LMAO, so i wasnt saying a word like "you cant DO that...", 'cos he was no newbie, and i was.

it was a fairly light load. He said at close range thay flew better than one would think, as a bullet gets unstable when they slow DOWN at the end of flight to subsonic, hit/make turbulence, and tumble... but that projectiles get a bit of tumble out the muzzle as they GET to supersonic speed too, and that a pill starting out at subsonic speeds, never has to endure these bad periods (though the round was naturally a close-in proposition, he said the heavy Butt-first backwards loaded pill approach worked very well, and hit hard at close range with a heavy pill going moderate speed, that big blunt end striking first.

anyone wanna clean up my memory on this??? I KNOW i got the "general gist" of it recalled.

when you really think about it, and you plan to use a chrony and work DOWN in speed 'till youit SUBsonic, it all makes a bit of sense. The extremely heavy pill one would at first blush THINK would no way stabilize at such a slow speed in a weight/twict gross mismatch, but he said when starting out subsonic, the rules were slightly different, and the butt-first pill loading helped tremendously, and grouped better than you would think.

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Tailgunner
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posted 08-19-2006 10:07 AM    Click Here to See the Profile for TailgunnerClick here to email TailgunnerEdit/Delete MessageSearch the Rifle Cartridges forumIP LoggedReply w/Quote
A quick run through LoadTech yeilds some interesting possibilities with the Sierra 180gr (.311) softpoint

PB from 4.3gr (765fps) to 4.5gr (795fps) (they show 4.8gr (835fps) as max, but also a high possibilty of exceeding pressure at that level)

IMR 4756 from 5.7gr (800fps) to 6.0gr (830fps) (they show 6.4gr (870fps) as max, but also a high possibilty of exceeding pressure at that level)

IMR 7625 from 4.6gr (770fps) to 4.9gr (810fps) (they show 5.1gr (835fps) as max, but also a high possibilty of exceeding pressure at that level)

IMR 800-X from 5.7gr (810fps) to 6.1gr (850fps) (they show 6.3gr (875fps) as max, but also a high possibilty of exceeding pressure at that level)

H-4227 from 7.9gr (900fps) to 8.1gr (915fps) (they show 8.7gr (965fps) as max, but also a high possibilty of exceeding pressure at that level)

With a 220 MK, the choices get a little narrower

PB from 3.7gr (675fps) to 3.8gr (690fps) (they show 4.1gr (725fps) as max, but also a high possibilty of exceeding pressure at that level)

IMR 4227 from 15.1gr (1160fps) to 16.4gr (1220fps) (they show 16.8gr (1235fps) as max, but also a high possibilty of exceeding pressure at that level)

Hope that helps.

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posted 08-19-2006 01:19 PM    Click Here to See the Profile for CBBClick here to email CBBEdit/Delete MessageSearch the Rifle Cartridges forumIP LoggedReply w/Quote
THE loading is as follows...

147-220gr FMJBT loaded backwards
6.1gr of Red Dot
7.62x39 brass w/ primer hole drilled to 9/64th's
CCI large rifle primers
1020 fps
good to 200-250 yards

case capcity is 75% or better with the RD

All times are ET (US)

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