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Old 07-26-2012, 11:48 PM
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Default Please examine my Polish tantal



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Purchased a century polish tantal a few weeks ago from a local gun guy like myself. The rifle looked really nice, and the price was under $500 so I was happy to buy a cool AK74. The problem was I didn't read up on this rifle and all the horror stories about keyholing. Can you tell me how it shot. Serial number starts with Y00, 4 groove barrel (i dont know the twist).
Please watch my short video of the cardboard I shot and tell me what you think.
https://www.youtube.com/watch?v=_4xciEjKvb0

thank you.
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Old 07-27-2012, 01:02 AM
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MonsterMash MonsterMash is offline
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Benchrest it and shoot for groups at 100 yards. Not knowing your skill level, I'm assuming you're a fairly new shooter. Take as much of the human element out of it as you can, and fire from a rest of some kind. The 5.45 Russian is a fairly inherently accurate round. You should easily get 100 yard groups less than a pie plate in size.

If you do....then work on your skills. I don't see anything yet that would indicate a problem. That one questionable hole isn't enough to make a judgment on keyholing issues.
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Old 07-27-2012, 04:57 AM
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What position did you fire from? I assume standing off-hand/unsupported? 40 yards is a little close to see keyholing issues. I agree with MonsterMash: shoot it rested or from prone supported at 100 yds and then look for signs of keyholing.
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Old 07-27-2012, 05:38 AM
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Correct. Just stood there and shot away. Nothing fancy at all. To tell you the truth I didn't realize accuracy was a part of the testing process. I just fired away. Sounds like I will have to do it again. thank you for your advice.
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Old 07-27-2012, 12:57 PM
Herd Sniper Herd Sniper is offline
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The groups on the paper showed no keyholes to me. One of the things that can cause a keyhole effect is if the ammo is not properly loaded with the right amount of propellant. In some calibers/millimeters a lack of proper propellant can cause some rounds to keyhole and, at the other extreme, too much propellant can also cause keyholes. There are other factors that can also cause rounds to keyhole such as the center of mass of the round being off or it hits something in route to the target.

Also to a certain degree just about all ammo will react differently on occasions and every now and again you may end up with the occasional keyhole for some unknown reason. But if your ammo is good, if the speed of the bullet isn't too fast or too slow and if the bullet is of a good design then you should get nice round little holes in paper.

Do as the other guys are telling you. Benchrest the rifle and fire at a target at 100 meters/yards to see what kind of a result you get. And do both a slow fire and then a fast fire. Test firing both ways let you see if your rounds string vertical or not. If you get a group of rounds generally in line but going upwards in a vertical fashion that could mean your rifle barrel needs to be better secured to your rifle in some fashion. Watch for vertical stringing too when testing your rifle because this means that it may not have been put together well.
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Old 07-27-2012, 01:35 PM
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thank you for taking the time to respond, your comment was very helpful.
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Old 07-27-2012, 02:13 PM
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I really like the 74. Mine shoots fairly well for a bas.... of a gun like nearly all ak's that are sold in this country. To get one that is not is in the $1000 range and up. Anyway the 7.62x39 is generally a 4-4.5 moa gun while the 5.45x39 is generally a 2-2.5 moa gun. The 74 had very little recoil so follow up shots are easier as well. And the ammo is much cheaper. Aim surplus has 1080 round cans for $149 or $139 each if you buy 2. However, no 5.35x39 ammo is manufactured in the USA. And it is virtually impossible to handload for it. So if this un treaty is passed the ammo would no longer be imported I believe so you need to have a lot stored up. If you but one 2160 round crate for $300 you would probably be ok, especially if you have other guns as well. They are fun guns to shoot.
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Old 07-27-2012, 08:03 PM
steve marshall steve marshall is offline
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THe reason for all the keyholing stories was that Century used the wrong diameter barrels. 5.45 rounds are .218", 5.56 rounds are .224". Century eventually corrected the problem.
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Old 08-01-2012, 07:09 PM
sachson sachson is offline
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I've seen AR's keyhole. Depends on the ammo...
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