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Posted: 7/27/2009 5:58:57 PM EST
Anyone know if this has been done ? ( obviously on a 308 size frame) It's a hellaciously accurate/ popular round in bolt guns, was wondering about the feasability in the AR type rifle.Any thoughts?
Link Posted: 7/27/2009 6:32:19 PM EST
With a useful barrel life just barely breaking 4 digits in bolt guns, likely less in semi auto's, I think you'd be MUCH better off with the .260 Remington. Barrels are also already available.
Link Posted: 7/27/2009 8:13:38 PM EST
6,5x284 is the last word in out to at least 1,000 yard bolt-action rifles. But this is only true in a really well built custom rifle with a 28" long top quality barrel and carefully handcrafted handloads. If you go through all this expense and effort AND learn to shoot long range (be good at reading the wind), you can be a top contender in F-class or NBRSA matches.

Now on a semi-auto platform I doubt you could get much more accuracy out of this caliber than 260 Rem, especially if you want a reasonable length barrel (22 or 24" long). The new 6.5 Creedmore would be an interesting choice, but I don't know of anyone doing this caliber in an AR10 platform....

I really think if you are wanting utmost precision you should go to a bolt-action. If you want semi-auto go to 6.5 Grendel in an AR15 action, or 260 Rem in the larger AR10 size semi-auto action.
Link Posted: 7/28/2009 8:29:49 AM EST
[Last Edit: 7/28/2009 8:31:26 AM EST by 1950Target]
6.5 X 284 is a great cartridge, but why reinvent the wheel. Build a .260 Remington instead.

No not the velocity and trjectory of the .284 based wildcat but still ballistically superior IN CERTAIN REPECTS to the .308 and since it is a .308 based case, ni magazine or feeding dificulties. Plenty of box stock brass and .308 brass to work with.

I have two FALs in .260 and they are some sweet shooting pieces. Its going to be cheaper and easier to deal with and in practical ballistics really no more diference than between the .30-06 and the .308.

Best of luck with whatever you decide to do!
Link Posted: 7/28/2009 8:38:37 AM EST
Originally Posted By BillSP1:
The new 6.5 Creedmore would be an interesting choice, but I don't know of anyone doing this caliber in an AR10 platform....


DPMS offers 6.5 Creedmoor. 24 inch SS barrel, 1x7.5 twist.
Link Posted: 7/28/2009 9:22:53 AM EST
im on my phone so limited browsing. but i take it the x284 is not a 284mm case length?

Posted Via AR15.Com Mobile
Link Posted: 7/28/2009 9:40:31 AM EST
[Last Edit: 7/28/2009 9:45:26 AM EST by cav_scout_tj]
the 6.5x47 is 47mm case
the 6.5 Creedmoor is 49mm case
the 260Rem is 51mm case

The shoulder angle varies, and case capacity is pretty close.

The 6.5x284 is 55mm case. More Info

The better question is what about a 6.5WSW? Then the answer is fast +++, low barrel life ––-. There is no free lunch.

The thing is that the 6.5x284 is designed to have a COL of like 3.2" While you *could* seat your bullets deep enough to get 2.8" for 308 magazine length, you give up any advantages over the 260/6.5 creedmoor by sticking those long bullets down your powder space.

Link Posted: 7/28/2009 10:51:32 AM EST

Originally Posted By cav_scout_tj:
the 6.5x47 is 47mm case
the 6.5 Creedmoor is 49mm case
the 260Rem is 51mm case

The shoulder angle varies, and case capacity is pretty close.

The 6.5x284 is 55mm case. More Info

The better question is what about a 6.5WSW? Then the answer is fast +++, low barrel life ––-. There is no free lunch.

The thing is that the 6.5x284 is designed to have a COL of like 3.2" While you *could* seat your bullets deep enough to get 2.8" for 308 magazine length, you give up any advantages over the 260/6.5 creedmoor by sticking those long bullets down your powder space.

http://www.6mmbr.citymaker.com/i/Tech%20Diagrams/65x284.png

Gotcha, a Win .284 necked down.

With the BC of 6.5 bullets, a 284mm case length I'm pretty sure could launch stuff into space
Link Posted: 7/28/2009 4:27:41 PM EST
Thanks for the info everyone.Forgot about the 6.5x284 being longer than a 308( checked some of my reloads for my f class rifle).well, never hurts to brainstorm though.I may look into the 260.....
Link Posted: 8/1/2009 8:12:15 AM EST
I you are still looking for a magnum velocity 6.5mm in an AR10 sized frame, there are numerous 6.5 wildcat versions of the short mags available. If I recall, Accuracy Systems offers a 6.5/300 WSM in either AR10 or DPMS. I've toyed with the idea of a 6.5/338 RCM, since the RCM case is a bit shorter and less fat than the WSMs. This would make it easier to fit some of the long, high BC 6.5 projectiles into the magazine, and would improve feeding vs the WSM based cartridges.
Link Posted: 8/4/2009 4:52:19 AM EST
Originally Posted By Rothamber:
I you are still looking for a magnum velocity 6.5mm in an AR10 sized frame, there are numerous 6.5 wildcat versions of the short mags available. If I recall, Accuracy Systems offers a 6.5/300 WSM in either AR10 or DPMS. I've toyed with the idea of a 6.5/338 RCM, since the RCM case is a bit shorter and less fat than the WSMs. This would make it easier to fit some of the long, high BC 6.5 projectiles into the magazine, and would improve feeding vs the WSM based cartridges.


A lot of people use the remington SAUM cases for wildcats over the WSW. A 6.5x7mmSAUM would be an easy wildcat. The ruger cases are pretty new, but give more good options. I am still waiting for a production 300 RCM barrel/upper for AR-10 sized platform.
Link Posted: 8/4/2009 7:00:29 AM EST
I ordered a 260 Remington from DPMS about a year ago. They haven't worked out the issue of both the 260, and the 6.5 Creedmoor blowing primers, so after waiting almost a year, I changed my order to 308. If they ever do work the bugs out of the 260, I'll probably order a barrel and do a swap out. But for now, I think anything other than the 308 isn't an option.

There are other calibers like the 6.8 SPC and the 6.5 Grendel though, but I gathered from your initial posting that you wanted something with quite a bit more "punch" at 1000 yards.
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