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Hunting
Long Range Hunting & Shooting
KEY HOLE PROBLEM
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<blockquote data-quote="budlight" data-source="post: 1997837" data-attributes="member: 2939"><p>Like the other poster said. Your L looking thing is not "Key Holing" It would seem like 2900 fps isn't fast enough to blow up a bullet with 7:1 twist, but that is what is happening. the 7 twist is exceeding the design limitation of that bullet. I did it many years ago with 50 gr bullets out of 26 inch 22-250. It became a shot gun and it would plaster all over the paper at 25 yards.</p><p></p><p>Key holing like the above poster I was able to do with 55 gr 223 AR-15 with a 20 inch barrel 7:1. 3200 fps I ended up throwing the barrel away and went to 9:1 with lighter bullets and 8:1 with up to 80 gr with 20 inch barrels.</p><p></p><p>I did some research and Lilja barrels doesn't even make the 7:1 twist. So I would tend to say that 7 is not a good option at that velocity for that bullet</p></blockquote><p></p>
[QUOTE="budlight, post: 1997837, member: 2939"] Like the other poster said. Your L looking thing is not "Key Holing" It would seem like 2900 fps isn't fast enough to blow up a bullet with 7:1 twist, but that is what is happening. the 7 twist is exceeding the design limitation of that bullet. I did it many years ago with 50 gr bullets out of 26 inch 22-250. It became a shot gun and it would plaster all over the paper at 25 yards. Key holing like the above poster I was able to do with 55 gr 223 AR-15 with a 20 inch barrel 7:1. 3200 fps I ended up throwing the barrel away and went to 9:1 with lighter bullets and 8:1 with up to 80 gr with 20 inch barrels. I did some research and Lilja barrels doesn't even make the 7:1 twist. So I would tend to say that 7 is not a good option at that velocity for that bullet [/QUOTE]
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KEY HOLE PROBLEM
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