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Posted: 8/12/2010 10:46:03 AM EDT
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I'm just curious as I've been hearing about the Tantals and Bulgarian AK-74's that are keyholing.
Now I have heard of bullet-testing 5.45's, that is seeing if a 5.45X39 bullet drops in or is held up short of the casing. My question: Is it actually a good representative on whether or not a 5.45 keyholes? It seems that (possibly?) the latest keyholing problems are from incorrect twist rather than an oversized bore. I know it's ONE way to check, but wasn't sure if that's what should be relied on. Another thing: I've heard that SOME lots of silver-bear,etc. are slightly under-sized for the round....possibly contribute to keyholing as much as the guns? I'm curious as there's a gunshow coming up (In about a month), and even if it's slightly cheaper online, with return garuntees, I'd like to look a gun over and check out any mistakes beforehand. Because that $35 shipping for a return cuts into the cheapness factor as well. Thanks! |
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The bullet test is a simple and quick way to see how badly a muzzle is eroded/worn, and could tell you if the barrel is grossly over sized for the round.
Personally I like to be more exact, and I carry a vernier caliper with me to gun shows and the like (plus about anywhere else, its amazing how useful those things are once you start using them). |
| A local shop has one of the earliest serial numbered Century Tantal rifles. Other than test firing at the factory (assuming they did), it has never been fired. I took a Bulgarian surplus round and put it in the muzzle. The only thing that stopped it from dropping in, was the case mouth. You can draw your own conclusions from this, but my conclusions are very different than anything Century has said about this issue. |
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