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3/30/2008 10:20:00 AM EDT
I have a Tantal rifle in 5.45x39.  Surplus ammo and Barnaul 55 gr HP ammo does fine, except for an occassional failure to go into battery with the Barnaul HP's.  When that happens, the bullet has engaged the rifling as it marks the bullet near the mouth of the case.  When I change to Golden Tiger 60 gr FMJ ammo, there is no failure to feed, chamber, etc. and the weapon functions and fires with no problems except that the bullets tumble and "keyhole" on the target at 100 yards and even as close as 50 yards.  The barrel twist is 1x8.  I'm thinking that there may not be enough freebore or the GT stuff might actually be heavier than 60 gr.  I do have another rifle in 5.45x39 and it works fine with all the above ammo.  

Has anyone here ever had the same problem?  Looks like the Tantal will be going back for warranty repair and/or a new barrel.

Thanks.
3/31/2008 5:48:04 AM EDT
[#1]
Try it with and without the muzzle brake, just in case there is voodoo in the harmonics that makes only one hit on it's way out. I wonder if the GT accidentally came with the 70gr round from Uly/Wolf MC
3/31/2008 6:46:28 AM EDT
[#2]
Wasn't there a thread a month or so ago on this very topic?  IIRC someone pointed out that some Tantals were assembled with American-made barrels in .223 ---- which isn't helpful.  Maybe do a search, it might come up.  If the ammo works well in your other rifles, then it's the gun.
3/31/2008 4:15:38 PM EDT
[#3]
In that case, look for chrome lining of the bbl.
4/1/2008 9:09:22 AM EDT
[#4]
Thanks Gents!  I'm pretty positive it is the barrel.  Going to pull and weigh a few GT bullets today and re-check the muzzle break for strikes.  Both guns are Century builds, one with chrome lining and the Tantal without.  The Tantal is going back this week for them to check.  If it can't be squared away I'm going to "bite the bullet" and have the barrel replaced with a new one that is chrome lined.

Best regards,
Phil
4/2/2008 4:16:08 AM EDT
[#5]
Off top of head, there are NO chromed US mfg AK bbls yet
4/2/2008 1:42:18 PM EDT
[#6]
I have discussed this with a contact in the barrel manufacturing industry.  The chamber reamer is no problem and he can get the barrel made in either stainless steel or chrome moly.  Getting a CM barrel chrome lined is the next step to be addressed.
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