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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 11-13-2012, 2:51 PM
USMCM16A2 USMCM16A2 is offline
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Default 6.8 SPC or 6.5 Grendel?

Folks,


Without changing from a standard 5.56 lower, for target and deer size game, SPC or Grendel, out to 500 yards. Wyoming Pronghorn. TIA A2
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Old 11-13-2012, 2:59 PM
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500 yards is pushing it. These are intermediate rounds, not full powered rounds. You may want to look at either getting closer or using more gun. That said, the 6.5 is the cartridge that is set up more for long range. Inside 300 yards they are more or less the same. Past 300 yards the Grendel has a slight edge. But I wouldn't use either for medium game past that range.

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Old 11-13-2012, 3:03 PM
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Out to 500 yards neither are ideal, as they both have a slow starting velocity. At 500 yards the BC of the Grendel does not provide that much advantage over the speed that can be achieved with the 6.8 with 100gr or lighter bullets or the Grendel's lower BC rated 100gr or lighter bullets. The Grendel is advertised as more of a target and long range cartridge and the 6.8 is advertised mostly as a short range hunting cartridge.

In reality, under 500 yards, their performance is so close that no animal is going to be able to tell the difference. I would rate them more of a 300-400 yard hunting cartridge if you are really stretching it and know your capabilities. If you want a hunting cartridge to consistently perform in the field at 500 yards and fit the AR15 platform, the WSSM cartridges are your best bet.

That said my wife took her deer this year with one of our 6.8s at about 80 yards and I took my buck this year with a 243WSSM at a close range. Both cartridges worked equally well. My elk I took with one of my 243WSSM AR15s at 348 yards. I was glad I had the WSSM for that shot, there was no way I would have been confident with a 6.8 or a 6.5G in that scenario.
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Old 11-13-2012, 3:22 PM
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For 500 yard hunting, I think I would feel more comfortable with my new 6.5 Creedmoor (if it shoots).

I have a 6.8 SPC which is great but bullet expansion gets iffy past 300 yards.

Grendle has the same problem past 300 yards, ammo is less available, the magazines are funky and I just can't trust a guy with two first names (Bill Alexander).

6.5 Creedmoor in an AR10 or LR308 platform solves the problem with higher muzzle velocity, heavier bullets (which retain more velocity) and LR308 Pmags that work just fine. If you plug it in to a ballistic calculator, 500 yards still carries 1,000 fpe which should be enough with decent shot placement.

Another plus is that 6.5 Creedmoor is not terribly exotic for an LR308. Those WSSM chamberings in AR15s are kind of exotic.
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Old 11-13-2012, 3:25 PM
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Default Verwoest

Verwoest,


Do I have to move up to a .308 lower for the .243 WSSM? A2
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Old 11-13-2012, 3:27 PM
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Well, given the 95gr. TTSX's expansion threshold of 1700fps, theoretically it is capable of expansion out to 500 yards, not saying its ideal but it is possible to take game with it at that distance.

For target shooting, SSA's 140gr. Berger load is spectacular, it might also be used for hunting as well, according to SSA it still has 500ft/lbs of energy at 800 yards and is still supersonic out to 1000 yards.
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Old 11-14-2012, 3:23 AM
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Quote:
Originally Posted by USMCM16A2 View Post
Verwoest,


Do I have to move up to a .308 lower for the .243 WSSM? A2
No, the WSSM cartridges are for the AR15.
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Old 11-14-2012, 3:43 AM
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6.5 has the edge for the antelopes mention. Shot placement very critical as with every other caliber. It just doesnt require 1k ft lbs to kill. 9mm will kill deer dead and its got less than 300lbs at the mz its important to pimck a bullet that will xpand at the desired range. Personally I would opt for the wssms or 24/25dti chamberings
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Old 11-14-2012, 4:44 AM
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The 6.5 has longer legs. Should be fine on antelope out to 600. But I doubt you'll take a shot that long. Lots of stories online about 6.5 Grendel taking mid to large game at long range. Mark Larue took a bull elk at 450+ yards DRT with his Grendel. It was a rear quartering shot and went through and through.
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