Chills1994 Posted January 31, 2012 Share Posted January 31, 2012 Yessirreee bob! Just like the title says. keep the same lower, upper, bolt carrier group, bolt, just swap the barrel to a 6.5mm bore. what say you? maybe a little bit better performance than the .300 Blackout's rainbow like trajectory. Link to comment Share on other sites More sharing options...
bpipe95 Posted January 31, 2012 Share Posted January 31, 2012 6.5 Grendel? http://www.alexanderarms.com/index.php/products/65-grendel.html Link to comment Share on other sites More sharing options...
Chills1994 Posted January 31, 2012 Author Share Posted January 31, 2012 but...but... I thought the Grendel could be made from AK 7.62X39 Russian brass, so that means the case head dimensions are different than .223. Link to comment Share on other sites More sharing options...
bpipe95 Posted January 31, 2012 Share Posted January 31, 2012 Opps, I missed the same "bolt" part! doh! Link to comment Share on other sites More sharing options...
dchang0 Posted January 31, 2012 Share Posted January 31, 2012 IIRC, in the development of the 300 AAC Blackout, they tried smaller projectiles, but I forget what those cartridges were called. Should be fairly easy to find that info online. Link to comment Share on other sites More sharing options...
a.roberts Posted January 31, 2012 Share Posted January 31, 2012 SSK Industries does/did make a 6.5 Whisper. SSK Ind. They might have some ballistics data. Link to comment Share on other sites More sharing options...
highxj Posted January 31, 2012 Share Posted January 31, 2012 One version is called the 6.5 TCU. It's on an improved 223 case however and probably wouldn't feed that great in an AR. Still like my 6.8's even though it uses different bolt/mags.....110 gr. bullet at 2600+ fps in a carbine. Link to comment Share on other sites More sharing options...
Dan Sierpina Posted January 31, 2012 Share Posted January 31, 2012 A .223 case will yield a round with too long an overall length to fit in the mags. Either that or the bullet will need to be seated too deep to stay in place while feeding. I played with the 6mm-223 some years back. The Sierra 70 grain Match King was a great bullet for it, heavier/longer became too long. Link to comment Share on other sites More sharing options...
Griz Posted January 31, 2012 Share Posted January 31, 2012 And even if you do seat the bullet deep enough to fit in an AR mag, you'll either give up a bunch of powder capacity or be limited to short, stubby bullets with horrible BCs (same issues that the 6.8 SPC struggles with). Link to comment Share on other sites More sharing options...
David.Hylton Posted January 31, 2012 Share Posted January 31, 2012 Either go with the Grendel or Hornady is loading a 110 gr in the .300. I have a Grendel and like it. Dave Link to comment Share on other sites More sharing options...
cas Posted January 31, 2012 Share Posted January 31, 2012 As traditionally loaded, the TCU's are too long for the AR magazine. There may be a 6.5x45 out there since there's a 6x45 which is loaded for the AR. Link to comment Share on other sites More sharing options...
R-Bros_JLR Posted January 31, 2012 Share Posted January 31, 2012 (edited) ....but what if you took a .300Blackout case and necked it down? That would seem to eliminate the length issue. Would be sorta like a faster .300BLK?? Edited January 31, 2012 by R-Bros_JLR Link to comment Share on other sites More sharing options...
ChristianHE Posted January 31, 2012 Share Posted January 31, 2012 6.5 Grendel is the way to go in AR if you want to shoot a heavier, better BC bullet. I've been shooting 140 grain Nosler Custom Comps and 144 grain Laupa FMJs out of mine for years. Only had one problem, when I did not seat some 140's deep enough, they were hard into the lands and I broke two teeth off of a bolt. I get great accuracy at 600 and 800 yards, 1 MOA sometimes better. I'd love to see a picture of a .223 necked to 6.5/.264! Why not try it with 6mm?/.243 they go up to about 107 grains. Link to comment Share on other sites More sharing options...
Matt Griffin Posted January 31, 2012 Share Posted January 31, 2012 Can you take a 6.5 or 6.8 subsonic and have it still perform adequately as far as function and accuracy to 200yds? Link to comment Share on other sites More sharing options...
sparks1 Posted February 1, 2012 Share Posted February 1, 2012 I don't see a .223/6.5 as being a good cartridge. As stated above the case is too long for 6.5 bullets and you would give up powder capacity trying. I think the 6/.222 was tryed as a benchrest round for awhile decades ago, until the 6PPC came around and cleaned up the records. The 6.5 Grendel is based on the 6PPC concept. had an AR in the Grendel and loved it. But...in wheeling and dealing I sold the upper, built a 24" varmint .223 AND got a 6.5 CSS (Grendel) barrel for my Savage 10 FCP-HS precision. Now I have a .308 and 6.5 Grendel (actually 6.5 CSS) in one switch barrel rifle. Link to comment Share on other sites More sharing options...
Chills1994 Posted February 1, 2012 Author Share Posted February 1, 2012 keep the .223 headstamp, the bottom of the case basically, cut it off, like what you would do to convert .223 brass into blackout brass. and then "neck it down" to take a 6.5mm (.264") bullet. maybe push it out a bunch faster, say closer to 2,700 fps. Link to comment Share on other sites More sharing options...
Chills1994 Posted February 1, 2012 Author Share Posted February 1, 2012 Can you take a 6.5 or 6.8 subsonic and have it still perform adequately as far as function and accuracy to 200yds? anything subsonic is basically 1,000 fps or slower at the muzzle, so your choice of trajectories are: rainbow, more rainbow, and most rainbow. Link to comment Share on other sites More sharing options...
Chills1994 Posted February 1, 2012 Author Share Posted February 1, 2012 ....but what if you took a .300Blackout case and necked it down? That would seem to eliminate the length issue. Would be sorta like a faster .300BLK?? yeah, that's what I am talking about! Link to comment Share on other sites More sharing options...
Chills1994 Posted February 1, 2012 Author Share Posted February 1, 2012 Either go with the Grendel or Hornady is loading a 110 gr in the .300. I have a Grendel and like it. Dave my point being is everything stays the same, all you gotta do is swap the barrels. no special mags to buy, no special bolt to buy. keep the same .223 bolt and BCG. Link to comment Share on other sites More sharing options...
Chills1994 Posted February 1, 2012 Author Share Posted February 1, 2012 here is an online article about the 6mmAR which starts out as a Grendel case necked down to 6mm: http://www.accurateshooter.com/guns-of-week/gunweek068/ it pushes a 107 grain bullet at about 2750 fps, so about a 295 PF. but, alas, it requires a Grendel bolt, a NON-.223 bolt. Link to comment Share on other sites More sharing options...
Chills1994 Posted February 1, 2012 Author Share Posted February 1, 2012 SSK Industries does/did make a 6.5 Whisper. SSK Ind. They might have some ballistics data. A-ha! You're right. They have the 6.5 MPC (multi-purpose cartridge): http://sskindustries.com/6-5-mpc thanks! Link to comment Share on other sites More sharing options...
cas Posted February 1, 2012 Share Posted February 1, 2012 (edited) JD Jones does "whispers" (all on a 221 Fireball case) in 6, 6.5, 7, 30 and 338, I'm sure he would build you one if you wanted. Not sure you'd want to pay for it though. They're not what you'd call cheap. (ETA: Double checked, he does uppers in 6, 7 & 30. And like I said, not cheap. $1,100. Also the "6.5MPC" "The 6.5 MPC (Multi Purpose Cartridge) is a SSK development urged by Brian Hormberg (USMC) based on the 5.56 cartridge shortened and opened to 6.5 MM and the same OAL as the 5.56. In the M-16-AR-15 rifles it utilizes the 5.56 bolt and magazines as well as all other parts except the barrel itself. Its design adapts it to a short Close Quarter Battle rifle with a 12” barrel moving a 107 6.5 SMK at 2400 FPS with superior full auto controllability and excellent accuracy. The 12” barrel model easily puts it into the realistic 300+ yard combat category and longer barrels stretch that realistic combat range considerably further.") There's nothing new under the sun, and little new in the world of wildcats. Just this weeks name change and a minor case adjustment. Edited February 1, 2012 by cas Link to comment Share on other sites More sharing options...
Chills1994 Posted February 1, 2012 Author Share Posted February 1, 2012 Yeah, nothing new. move along folks. nothing else to see here. Bummer. Link to comment Share on other sites More sharing options...
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