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Thread: Would a 6.5x284 work in an AR-10 size platform

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    Member Float Pilot's Avatar
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    Default Would a 6.5x284 work in an AR-10 size platform

    Do any of you AR-10 type experts think a 6.5x284 would work in an AR-10 size platform.
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    I would not consider myself an expert but I have done extensive research into what you can't run through an AR10 or other AR pattern .308 rifle.

    I see no reason why you couldn't, Accuracy Systems chambers AR10s in 284 win and they do lots of custom AR10 work (I constantly drool over their AR10 in .450 Marlin).

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    Member Float Pilot's Avatar
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    I would think that a 20 or 22 inch Ar-10 size rifle in 6.5x284 would be a real zapper.

    I wonder what would happen if you necked it down to 6mm (243) ???
    Floatplane,Tailwheel and Firearms Instructor- Dragonfly Aero
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    Member arizonaguide's Avatar
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    As far as length, I show both the .308 and the "original" .284 with an overall (loaded) cartridge length of 71.12mm...so it sounds PERFECT for it! I believe the 6.5 may even be a little bit shorter loaded cartridge. Maybe a simple matched Barrel/Bolt change....however, I'm showing the .284 to have a slightly larger diameter case than the .308,...so you'd have to see about magazine and extraction, boltface issues, ejector port size, etc. So, maybe yes, maybe no.

    Like Zaxon says...check with Accuracy International. They could line it out for you. I'd be interested to know the specifics too
    That does sound like a sweet setup.
    http://precisionshooting.com/psm_2007_04_frame.html

    Quote Originally Posted by Float Pilot View Post
    I wonder what would happen if you necked it down to 6mm (243) ???
    http://www.dpmsinc.com/store/product...=1998&cat=1759

    and some other calibers...
    http://www.dpmsinc.com/firearms/

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    Member c04hoosier's Avatar
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    Correct me if I'm wrong, but I believe the .308 and .284 have the same RIM diameter, even though the actual case diameter is fatter on the .284. In other words, the .284 is a rebated rim design. That being the case, the standard .308 bolt should work as far as I know. If I remember correctly, the .284 was designed that way specifically so it could function in a short action, but have ballistics roughly equivalent to the .280 Rem. At that point, the only thing you would have to worry about is feeding, ejecting, etc. as Arizonaguide mentioned.

  6. #6

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    I think it really depends on how deep you seat the bullets. The 140 grain bullets are fairly long. I think some guys build 6.5-284's on long actions because of this.

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    Member gunbugs's Avatar
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    Probably the only real issue would be feeding the fatter case. That might be a bugger to get working right.
    "A strong body makes the mind strong. As to the species of exercises, I advise the gun. While this gives moderate exercise to the body, it gives boldness, enterprise, and independence to the mind."

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    Member Darreld Walton's Avatar
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    Default Without firsthand knowledge,

    nor having attempted that particular conversion, I see at least two, possibly a third problem crop up.
    First up is that fat case. As mentioned, it could be a bugger to get to feed reliably and consistently, though I know that for awhile, Olympic listed a few of the WSM rounds, so perhaps it's not something that couldn't be overcome.
    Second is the short neck, that would be shorter by necking it down, meaning those 6.5 bullets would be seated really, really deep, or long enough that you'd need a magazine/receiver that would handle the additional length.
    Why not just go with the .260 Remington, which is simply the .308 case necked down (or a .243 necked up), that DOES function, is available, and in the handier 16-18-20 inch barrels, is a lot more efficient than the .30-06 capacity .284 Win. case? Just thinkin'....

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    Member arizonaguide's Avatar
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    Quote Originally Posted by arizonaguide View Post
    Like Zaxon says...check with Accuracy International. They could line it out for you.
    Sorry, I meant Accuracy Systems.
    http://www.ar-10-rifles.com/index.php

  10. #10

    Default 6.5-284

    I have a couple 6.5-284's. I would recommend the 260 if you are going to use it on that platform. The reason is that you really won't gain anything over the 260 when you have to seat bullets deeply to fit the magazine. I have a short action 700 in 6.5-284. The velocities that I get aren't really anything over a 260. The only problem with the 260 is if you want great brass you have to form it.

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    Member arizonaguide's Avatar
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    I sure hear a lot of good about the various 6.5 bullets themselves though.

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