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Old 12-19-2010, 01:37   #1
ckrockets
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Hot 7.62X39

If one was to pull down steel cased loaded Russian made 123gr 7.62X39 and reload them, slowly upping the powder charge...What would be the initial pressure signs one would see?

remember...steel cases should be stronger than brass and berdan primer has those two small holes instead of the one larger on boxer

It would be interesting to see if one could safely get a few hundred more fps out of this round.

But still...there has got to be a reason the Russians settled on the 2400fps range with this round.

Any thoughts?
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Old 12-19-2010, 03:18   #2
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Probably because Russians are cheap commies and they're afraid of getting sued in the World Court by Zambia or some other small third world country when too many people with too little knowledge and too much ammo blow up their guns.
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Old 12-19-2010, 03:26   #3
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Quote:
Originally Posted by ckrockets View Post
If one was to pull down steel cased loaded Russian made 123gr 7.62X39 and reload them, slowly upping the powder charge...What would be the initial pressure signs one would see?

remember...steel cases should be stronger than brass and berdan primer has those two small holes instead of the one larger on boxer

It would be interesting to see if one could safely get a few hundred more fps out of this round.

But still...there has got to be a reason the Russians settled on the 2400fps range with this round.

Any thoughts?
this
http://izismile.com/2010/12/16/ak47_...his_hands.html
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Old 12-19-2010, 04:09   #4
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Quote:
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exactly!!!!
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Old 12-19-2010, 07:37   #5
steve4102
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Quote:
Originally Posted by ckrockets View Post
If one was to pull down steel cased loaded Russian made 123gr 7.62X39 and reload them, slowly upping the powder charge...What would be the initial pressure signs one would see?
Assuming you are shooting an AK or other semi-auto like the Ruger Mini, what do you think the pressure signs would be if you did this with brass cased ammo?

The 7.62x39 runs at 45K psi, at what pressure do you think any pressure signs should show up?
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Old 12-19-2010, 10:48   #6
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Originally Posted by emopunker2004 View Post

That oughta buff right out.


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Old 12-19-2010, 13:14   #7
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The Soviets chose the chamber pressure they did because they found that a higher chamber pressure required more attention to detail and a higher rejection rate during cartridge case production. The muzzle velocity was chosen to (equal or) "better" the 7.92x33 German cartridge. Steel cases might not be stronger than brass cases but highest velocity with lowest pressure can be found using Vhitavuori N-120 powder if you can find it. Yugoslavia loaded the 7.62x39 M67 cartridge to a higher chamber pressure and used brass cases.
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Old 12-20-2010, 12:03   #8
CTSixshot
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First off, I'd not recommend trying to get more bang from a particular caliber, but rather just go to a more powerful cartridge.
"We need more power, Scotty!"
That said, Lyman 47 shows highest velocities with the 125g Sierra SP (#2120) with the maximum charge of 30.0g Reloader 7 (compressed load/2.200" COL): 2528 fps.

Another load with a Sierra 110g HP (#2110), same COL, shows a maximum charge of 26.7g of AA1680 at 2533 fps.

Now, Speer 13 shows their 125g 303 Spitz-SP (#2213) going fastest with 28.0g of AA1680 at 2544 fps, (compressed load/2.150" COL). With a maximum charge of Reloader 7 (27.0g) at 2429 fps.

Note: Lyman used a universal receiver in their tests; Speer, a Ruger M77 Mkll.

Last edited by CTSixshot; 12-20-2010 at 12:07..
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