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  #1  
Old 05-29-2010, 11:38 AM
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ive been thinking would taking a 6.5 creedmoor or 6.5x47 lapua or .260 rem necking it up to what ever caliber that would be a short action possibly in a ar10 for big game hunting at 700yrds plus

im stuck between multiple calibers what do you think is best for this application

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Old 05-29-2010, 12:01 PM
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Don't think your choice(s) would be possible for 700 + yard shots on Big Game.
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Old 05-29-2010, 12:29 PM
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[QUOTE=creedmoor;508995]ive been thinking would taking a 6.5 creedmoor or 6.5x47 lapua or .260 rem casing and necking it up to what ever caliber that would be a short action possibly in a ar10 for big game hunting at 700yrds plus

im stuck between multiple calibers what do you think is best for this application[/QUOTE
ive been thinking maybe using a hornady .284 7mm bullet or .338 bullet in 6.5mm case
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Old 05-29-2010, 01:08 PM
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Not sure what you're asking, but the .260 Remington necked to 7mm is a 7mm-08. I'd just leave it as it is.
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Old 05-29-2010, 02:45 PM
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...and a 7mm-08 STILL isn't a 700 yard big-game rifle. You can probably retain good accuracy that far out there, but energy will have fallen off enough that clean, ethical kills will not be a consistent result. I can't think of a short-action case that is capable of that level of performance, except for possibly a 6.5WSM. (See other current thread on this topic.)
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Old 05-29-2010, 04:13 PM
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is there an ar10 varient thats chambered in a cartridge thats capable of big game hun

is there an ar10 variant that,s chambered in a cartridge that,s capable of big game hunting at 700yrds plus
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Old 05-29-2010, 06:08 PM
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Well, that's a slippery slope that I'm going to stay away from.

There are plenty of threads on what is shooting and what is hunting. Each person has to make their own decision about what a given cartridge is capable of, as well as what THEY can do, personally. The long-range shooters I have respect for are not using an AR10 variant or a 308-based cartridge to accomplish those shots.
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Old 05-30-2010, 05:28 AM
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Short-action, non-magnum cartridges such that the AR-10 can easily be made to chamber are fine for punching holes in paper at 700 yards. However, traveling through 700 yards of atmosphere takes a heavy toll on velocity. Given the starting velocities of this class of cartridge, none of them will retain enough velocity at 700 yards to expand reliably, let alone the downrange energy to offer a reasonable likelihood of a clean kill.
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Old 06-01-2010, 03:53 PM
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As the ethics have already been discussed I won't cloud the issue any further. I think the most long range potential you could get out on an AR-10 platform would be a 300 RSAUM from DPMS, which I am not sure if they make anymore, you might have to find one on the used market.

The other one that comes to mind is Olympic started making a .300 OSSM, but I have no idea what the ballistics are compared to the RSAUM. There are some wildcats out there, but I think the above two are about the most power you will be able to wring out of the AR-10 for distance shooting.
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Old 11-29-2013, 03:08 PM
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6.5 wild cat in 223 brass

Has anyone had any experience with using a 6.5 bullet in 223 brass.
I've got some 300 black out barrels and am impressed but want a much better B.C. and am thinking why not use a 6.5 bullet instead of a >30 bullet and get more distance and with the same punch?
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Old 11-29-2013, 03:32 PM
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Quote:
Originally Posted by Majorpain77 View Post
Has anyone had any experience with using a 6.5 bullet in 223 brass.
I've got some 300 black out barrels and am impressed but want a much better B.C. and am thinking why not use a 6.5 bullet instead of a >30 bullet and get more distance and with the same punch?
The 6.5 TC/U is a known wildcat that's been around for many years. While it's certainly an option, the Creedmoor is the better way to go.
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Old 11-29-2013, 06:51 PM
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6.5 tc/u

Thanks for the reply,

I have been looking at the creedmore and almost sold on it for my next build.
However I would like to stay in the AR-15 platform instead of an AR-10 platform for less weight.
That's why I was asking about it.

SO is the 6.5 TC/U based off the same brass as used in a normal 223 AR?
Like to stay with common components and same bolt and mags.
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Old 11-30-2013, 03:58 AM
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Quote:
Originally Posted by Majorpain77 View Post
Thanks for the reply,

I have been looking at the creedmore and almost sold on it for my next build.
However I would like to stay in the AR-15 platform instead of an AR-10 platform for less weight.
That's why I was asking about it.

SO is the 6.5 TC/U based off the same brass as used in a normal 223 AR?
Like to stay with common components and same bolt and mags.
Yes, the 6.5 TC/U (originally designed by Wes Ugalde for the Thompson Center Contender single-shot pistol) uses standard 223 brass, with the case reformed to shoot .264" bullets.

For your money, you'd be MUCH better off to buy an AR-15 chambered in 6.8SPC. The bullets are .013" larger, but your build cost will be far less. Ammo and brass are readily available and I suspect they will continue to be in the foreseeable future. If you like working with wildcats and want something "different", an AR shooting the 6.5 TC/U would certainly keep ya busy!
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Old 11-30-2013, 07:31 AM
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The .264 LBC-AR / 6.5mm Grendel works in a AR-15 platform and lets you take advantage of the BC available from 6.5mm bullets. However, it does have a bigger head diameter and results in lower magazine capacity. Considerably more velocity than the 6.5mm TC/U. I guess your choice depends on what you want to do with it.
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Old 11-30-2013, 09:09 AM
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Thanks,

I'm very familiar with the Grendel my brother and I built one a few years ago before Hornady took on the line for producing ammo. We had trouble getting ammo or components back then and sold it. Have been following it since then and am thinking hard about it again to but have heard there are feeding issues because of the larger case size. Not good for a MBR. Although the range and accuracy are very attractive.
Not as good as the Creedmore but the best in an AR-15 platform except Maybe the AR 270 by AR Performance which I am checking into. Again it would be an experiment which tends to breed problems!

Which is why I was looking at every option closely before deciding on the next build/conversion for my 223 AR which I will keep everything to convert back if needed! Which is why using the same mags is important to me as well! I may be talking myself back into the Creedmore in-spite of it being a heavier platform by nature! Keep my AR-15 as a 223/300 Black out and call it good!
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