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Reloading
New .22 Cal Matchking
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<blockquote data-quote="brianwinzor" data-source="post: 64996" data-attributes="member: 1067"><p>Jeff (Rost 495), Thank you for posting the data on the 223 with the 90 grain bullets and the 6.5 twist. Also, I didn't know that the 90 Jlk uses a 6mm J4 jacket, but it doesn't surprise me. </p><p></p><p> I made mention in my post on the 257 jacket as part of my attempt to answer the issue, of whether the bullet construction of the various 90 grain bullets, was adequate to hold together at the high rpm's generated by the 6.5 or 7 twist barrels.</p><p></p><p>About 6 months ago, I emailed Corbins bullets, when investigating the possibility of making my own 80 - 90 grain bullets. I have cut and pasted my question and his answer: (Q) "Would the J-22 Jackets which are .705 inches in length, be long enough to make bullets up to 90 grains in weight or would I have to use jacket reducing dies to draw larger caliber jackets down to .224." (A) " Oh, heavens no! They make up to maybe 65 grains with lead tip. You would need to draw down a .257 jacket to .224 for a 90 grain weight. It works rather well. We have made many sets of these recently, as the current trend leans toward exactly what you ask about."</p><p></p><p>I was interested to hear that you have used 3 Pac Nor 6.5 twist barrels in your .223, and obviously had great success with them. I am about to order a barrel for the .224 Clark and received an email reply from Pac Nor, who were cooperative, and willing to send to me direct any barrels ordered by me, as unlike Krieger and Lilja, they didn't have an Australian importer. I will certainly contact them again to tie up the loose ends and place an order.</p><p></p><p>Your information confirms that the 90 grain bullets of JLK work well with a 6.5 twist in a 223 at about 2700 - 2800 fps. I have also noted that the 22 BR shooters are also using the 6.5 twist with the 90 grain JLK at velocities of 3000 - 3100 fps, and that the 22/243 Middlestead, 22/6mm AI,etc shooters are successfully using a 7.0 twist barrel at velocities of 3,400 - 3500. My guess is that around 3,200 fps (329,142 rpm) the ability to switch to a 7 twist barrel occurs. </p><p></p><p>I agree with you that the introduction of the 90 grain Sierra MK with a .504 BC is not likely to make those currently shooting the JLK 90 VLD with .570 BC switch across, unless there is a significant gain in accuracy. Out of curiousity what is the length of the JLK 90 grain VLD?</p><p></p><p>Hopefully Richard Graves 80 &amp; 85 grain Wildcat ULD bullets which are currently in transit will soon arrive. I will also see if I can somehow source some JlK 90 grain bullets, OK Weber (JLK agent) told me that they are no longer exporting. Regards, Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 64996, member: 1067"] Jeff (Rost 495), Thank you for posting the data on the 223 with the 90 grain bullets and the 6.5 twist. Also, I didn't know that the 90 Jlk uses a 6mm J4 jacket, but it doesn't surprise me. I made mention in my post on the 257 jacket as part of my attempt to answer the issue, of whether the bullet construction of the various 90 grain bullets, was adequate to hold together at the high rpm's generated by the 6.5 or 7 twist barrels. About 6 months ago, I emailed Corbins bullets, when investigating the possibility of making my own 80 - 90 grain bullets. I have cut and pasted my question and his answer: (Q) "Would the J-22 Jackets which are .705 inches in length, be long enough to make bullets up to 90 grains in weight or would I have to use jacket reducing dies to draw larger caliber jackets down to .224." (A) " Oh, heavens no! They make up to maybe 65 grains with lead tip. You would need to draw down a .257 jacket to .224 for a 90 grain weight. It works rather well. We have made many sets of these recently, as the current trend leans toward exactly what you ask about." I was interested to hear that you have used 3 Pac Nor 6.5 twist barrels in your .223, and obviously had great success with them. I am about to order a barrel for the .224 Clark and received an email reply from Pac Nor, who were cooperative, and willing to send to me direct any barrels ordered by me, as unlike Krieger and Lilja, they didn't have an Australian importer. I will certainly contact them again to tie up the loose ends and place an order. Your information confirms that the 90 grain bullets of JLK work well with a 6.5 twist in a 223 at about 2700 - 2800 fps. I have also noted that the 22 BR shooters are also using the 6.5 twist with the 90 grain JLK at velocities of 3000 - 3100 fps, and that the 22/243 Middlestead, 22/6mm AI,etc shooters are successfully using a 7.0 twist barrel at velocities of 3,400 - 3500. My guess is that around 3,200 fps (329,142 rpm) the ability to switch to a 7 twist barrel occurs. I agree with you that the introduction of the 90 grain Sierra MK with a .504 BC is not likely to make those currently shooting the JLK 90 VLD with .570 BC switch across, unless there is a significant gain in accuracy. Out of curiousity what is the length of the JLK 90 grain VLD? Hopefully Richard Graves 80 & 85 grain Wildcat ULD bullets which are currently in transit will soon arrive. I will also see if I can somehow source some JlK 90 grain bullets, OK Weber (JLK agent) told me that they are no longer exporting. Regards, Brian. [/QUOTE]
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