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Posted: 8/31/2003 1:55:28 PM EDT
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Took my new SAR-2 (5.45x39) out to the range today. After I was done, while picking up the empties, I noticed about 90% of the casings had cratered primers and/or primers that were backing out. One in ten had splits on the necks. Fired around 200rnds- no problems with feeding or ejection. I've fired several thousand rounds of Wolf of various calibers, with no problems what so ever. If anything, I've found Wolf to be slightly underpowered rather than too hot. So what do you think? Headspace seems a logical guess. Anybody had similar problems? Ok, this is the worst of the lot... notice the protruding primer. I'm going to try out some Barnaul and see if there is any difference. 
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To piggyback on this thread: Every round of Wolf and Barnaul I've ever put through my ORF/Bulgie 74 has had seriously cratered primers. However, as there are none of the other classic symptons of over-pressure present, and as the gun runs great, I have thus far chosen not to worry about it. Have I been reasonable or, do I have an impending problem I should worry about? Thanks, all. |
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Every 74 bolt has a dished out area around the firing pin. Look at the bolt face and you will see it. Romy bolts hame it and Bulgy bolts have it. I speculate this is a deliberate design feature to form a seal around the firing pin tip to prevent primer anlus from being blown back into the firing pin channel. |
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I agree with the others. All of the 5.45 ammo that I have fired has exhibited primer flow and it does not seem to be a problem. It seems like the primer cup material is not quite hard enough to resist the presure of firing but, other than the obvious primer flow, everything works fine. However, if the whole primer *body* sticks out from the rear end of the case, you probably have excessive headspace. This brings up another question. If an AK does have excessive headspace, how can this be fixed? The barrel is already drilled and pinned in the position that has too much headspace. The only thing that I can think of would be to press the barrel to the correct position using gauges and then redrill and use an oversize pin. Is this it? What can be done about excessive headspace? Thanks Drue |
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