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Post by letaz77 on Aug 25, 2013 22:17:17 GMT -8
I am the proud owner of a 16" 7.62x39 AR-15. I understand this cartridge limitations and fortes very well. The infamous reputation it has came from the combination of a hard hitting 7.62mm caliber bullet and its performance out of the iconic and readily available AK47 style weapons which have a 16" barrel.
So why it is that a cartridge that is quite similar to the 7.62x39mm Russian (referring to 243 lbc) cannot perform that well with light to mid weight bullets out a 16" AR? What if we used faster burning powders, like those found on 7.62x39 reloading manuals?
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Post by pasttense on Aug 26, 2013 7:59:44 GMT -8
It all comes down to what your goal is if you want to approximate .243Win ballistics you need a long barrel if you are not so worried about that a sixteen may be just fine. If I was building a rifle and did not have a bunch of 6.5Grendel brass and die set I would go the 6 by 6.8 route .
Paul
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Post by letaz77 on Aug 26, 2013 11:50:05 GMT -8
Thanks, Paul. I had a Grendel which was the apple of my eye, until my wife was pregnant with our little one a wanted me to get rid of my toys. I used to make Grendel brass by fire forming 7.62x39mm Russian brass. I assume I could still do the same with 6 lbc, right?
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Post by GLSHOOTER on Aug 26, 2013 12:53:55 GMT -8
You can push a 6.5 right with the 7.62X39. A 110 at 2300 is doable and will have a better bullet. The 264 wasn't built for that but it can match anything the other can do with a higher BC.
You can make 243LBC cases out of 7.62 if your time is cheap.
Greg
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Post by pasttense on Aug 26, 2013 21:08:28 GMT -8
To add a little to the above comments the 243lbc is a cartridge you have to make brass for, the 6.5Grendel/.264lbc are cartridges you may choose to make brass for. One thing people don't pay much attention to is impact velocity for bullet performance. Lower velocities limit your range in more ways than knowing where the round goes sub-sonic. This was not a consideration with non-expanding FMJ projectiles. Paul
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Post by letaz77 on Aug 27, 2013 12:58:11 GMT -8
You can make 243LBC cases out of 7.62 if your time is cheap. Greg My time is not cheap, but I have found reloading to be therapeutic.... It is quality quiet and alone time once a week.
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Post by GLSHOOTER on Aug 27, 2013 14:37:10 GMT -8
You can make 243LBC cases out of 7.62 if your time is cheap. Greg My time is not cheap, but I have found reloading to be therapeutic.... It is quality quiet and alone time once a week. It takes me about 45 minutes to make 100 243 cases out of of 6.5 Grendels. The BHW reamer is a no-turn design with Lapua brass. Much easier than necking down and blowing out the 7.62. Greg
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Post by Deleted on Aug 27, 2013 17:58:00 GMT -8
If you don't use Lapua 6.5 brass you WILL have to turn your necks. Making brass from a 7.62 case is an almost guarantee you will have thick necks/
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