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

Don't think your choice(s) would be possible for 700 + yard shots on Big Game.

[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

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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God Bless,

EW

...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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Ask me about QDMA.

is there an ar10 variant that,s chambered in a cartridge that,s capable of big game hunting at 700yrds plus

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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Ask me about QDMA.

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.

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.