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Author Topic: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another  (Read 3044 times)

Tyler Durden

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Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« on: January 29, 2012, 12:15:14 AM »
Hi everybody,

You know how the .300 Blackout can be made from .223 brass, right?

How about instead of a .30 cal projectile weighing from 110 to 220 grains for the .300 Blackout....how about a .223 parent case that has been (trimmed down?) and necked up to take a 6.5 mm projectile.

Has that been done already?

The advantage would be the 6.5 X whatever? would fire a lighter weight bullet at a higher velocity than the .300 Blackout and should be flatter shooting than the Blackout.

What say you?

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Tyler Durden

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Re: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« Reply #1 on: January 29, 2012, 12:17:53 AM »
oh, yeah, just like the .300 Blackout, the advantage would be you keep the same magazines, same lower, same upper, same bolt, same bolt carrier group, and it is just a barrel swap.
 ;D
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Pathfinder

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Re: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« Reply #2 on: January 29, 2012, 05:15:21 AM »
If your goal is a lighter, faster round, why not neck the 5.56x45 down to take .17HMR bullets?

The supersonic .300BLK may only be 110gr, but you're still thumping the target with a .30 cal bullet moving pretty fast, which is a good thing IMHO. Not to mention that the .300BLK has not demonstrated any of the feeding problems of similar "solutions", such as the AK 7.62x39 - at least so far.
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Big Frank

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Re: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« Reply #3 on: January 29, 2012, 04:50:08 PM »
The 6x.223 wildcat is almost as old as the .223 itself. Another .5mm would be easy to do. You would just need to neck it up.
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blackwolfe

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Re: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« Reply #4 on: January 29, 2012, 05:50:39 PM »
I like the idea, but then again I like 6.5 bullets.  There is the 6.5 Creedmore, but I think that may be more of a .308 based cartridge.  What's the .260 Remington?, but i don't think it has much of a following and may be waning in popularity.

I personaaly think it is hard to improve much on the Se 6.5x55.  There are some that have been out there, but from what I could see, didn't have much more velocity, and had other problems.  .264 Win Mag, the Westerner, and the .264 Rem Mag.

I believe their are the 6.5x.284 and the 6.5-06.
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Re: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« Reply #5 on: Today at 06:16:16 AM »
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mauler

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Re: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« Reply #5 on: January 30, 2012, 04:26:13 AM »
I think the 6.5 Grendel represents the best that can be gotten out of the AR-15 platform.
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Tyler Durden

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Re: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« Reply #6 on: February 05, 2012, 03:24:52 AM »
SSK Industries (of J.D. Jones and Whisper fame) has a 6.5 M.P.C. cartridge, that probably describes best what I was thinking:

http://sskindustries.com/6-5-mpc
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Big Frank

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Re: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« Reply #7 on: February 05, 2012, 04:27:48 PM »
I wonder how that differs from the 6.5 Whisper.
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alfsauve

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Re: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« Reply #8 on: February 05, 2012, 04:49:05 PM »
Quote from: Tyler Durden on February 05, 2012, 03:24:52 AM
SSK Industries (of J.D. Jones and Whisper fame) has a 6.5 M.P.C. cartridge, that probably describes best what I was thinking:

Yeah, that's a much better choice than the 6.8SPC.    I like that.  I've been wanting a 6.5  and that might be the ticket.  Just have to get a new upper.

The 260Rem could be called the 6.5-308 and wouldn't work on an AR15 platform.  It is offered as an AR10 by Panther though.
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Pathfinder

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Re: Maybe a new idea for a new AR15 rifle cartridge, 6.5 X something or another
« Reply #9 on: February 05, 2012, 05:43:28 PM »
Quote from: Tyler Durden on February 05, 2012, 03:24:52 AM
SSK Industries (of J.D. Jones and Whisper fame) has a 6.5 M.P.C. cartridge, that probably describes best what I was thinking:

http://sskindustries.com/6-5-mpc

Seems to be a wildcat/experimental round. No commercial ammo, and no powder load references on this site for reloaders. Seems to be proprietary as well, since it was invented by SSK. No indication there is a SAAMI spec either.

I gotta ask - what's the romance with the 6.5?
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