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Gold/Mining/Energy : Gold Price Monitor
GDXJ 108.29-0.9%4:00 PM EST

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To: E. Charters who wrote (90662)10/18/2002 8:50:01 AM
From: long-gone  Read Replies (1) of 116790
 
Chamber pressure .308 Winchester
Max Pressure: 52,000 c.u.p.
t6aluminum.tripod.com

See the note for the Galil this page:
"The change in caliber, from 7.62x39mm ComBloc to 5.56mm NATO, required numerous alterations. The AK-47's 4.2mm gas hole was reduced in diameter to 1.8mm. The Galil's most immediate predecessor was the Finnish Valmet M62 rifle and, in fact, early Galil prototypes were fabricated using M62 receivers made in Helsinki. However, as the 52,000 cup SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) pressure limit specified for the 5.56mm NATO round is far greater than that developed by the 7.62x39mm ComBloc cartridge, Galili abandoned the pinned and riveted, stamped sheet-metal receiver of the Valmet M62/M76 series and went to a heavy milled forging.
ak-47.net

NOTE DANGER
See MAX RECOMMENDED PRESSURE FOR RELOADING 7.62X39 from IMR
44400
43600
& this note:
"We suggest the charge weights shown be reduced initally by 10% to compensate for possible variations from the published data. The loads may then be increased as pressure indications permit."
imrpowder.com

This tells me there are SKS's & or AK-47's out there with CHEAP Chinese Steel used in the receivers / bolts that simply won't stand up to (maybe once maybe repeated) pressures seen in the 7.62 NATO!!!!

btw see dimensions & case pictures:
rim size 30 carbine(M-1 Carbine) - 0.36":
reloadbench.com

rim size .308 Winchester(7.62 NATO,M-14) - 0.473"
reloadbench.com

rim size 30-06 Springfield(A3-03,M-1 GARAND) - 0.473" (btw rim size shared with above) reloadbench.com

rim size 7.62X39(AK-47,SKS) - 0.447"
reloadbench.com

Would the shell extractor of the AK-47 even grab & remove the LARGER case?
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