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Posted: 8/22/2008 8:26:32 AM EST
I wanted to get a new upper for my AR15 and I was looking at the 6.8 SPC vs 6.5 Grendel.

Could someone explain the differences between these two cartridges as they relate to the AR plateform. Is one's performance better than the other, etc.

Thanks.
Link Posted: 8/22/2008 8:41:59 AM EST
Link Posted: 8/22/2008 10:30:48 AM EST
6.8 is optimized for urban/cqb 6.5 is more of a long range round, compare ballistics carefully before deciding!
Link Posted: 8/22/2008 10:50:39 AM EST
6.8 = 300m round

6.5 = 600-800m round
Link Posted: 8/22/2008 10:59:25 AM EST
Link Posted: 8/22/2008 1:06:37 PM EST
Seriously, it's not like the 6.5 magically appears 400 yard out, and it's not like the 6.8 drops to the ground after 300 yards. Darrr.

IMHO the 6.5 offers you most of the performance of the 6.8 at close range but has the added benefit of the long range the 6.8 doesn't have.

That said, parts and ammo for the 6.8 are easier to find, cheaper, and more often then not made from reputable AR companies.

Really it depends on how much you want to spend and what you will be using the thing for. Personally, I have a couple 5.56 AR's that do well in the 1-300 yard range, so I will get getting a 6.5 Grendel for Christmas.
Link Posted: 8/22/2008 1:09:16 PM EST
Link Posted: 8/22/2008 1:10:59 PM EST
Link Posted: 8/22/2008 1:14:53 PM EST
[Last Edit: 8/22/2008 1:58:18 PM EST by Forest]
Link Posted: 8/22/2008 1:43:26 PM EST
[Last Edit: 8/22/2008 1:52:36 PM EST by Paveway_]

Originally Posted By Cold:

Originally Posted By Paveway_:
6.8 = 300m round

6.5 = 600-800m round


the 6.8 will do fine past 300 M

subsequently the 6.5 will do fine in CQB too. These tend to be some common misnomers around here.


Sure the bullet goes that far fine. Speaking more of how much the bullets drop. The ranges listed are the upper end of their easy to use limits. All in generalities of course.
Link Posted: 8/22/2008 1:54:09 PM EST
Link Posted: 8/22/2008 1:57:45 PM EST
Link Posted: 11/5/2009 3:55:29 PM EST
If anybody is still on this, some barrel mfgs. have found a better chambering for the 6.8 SPC which increased it's muzzle velocity by 200 fps or so.
That would seem to put this topic on new ground. Does anyone have any idea of the relative popularity of these two calibers in recent history?
Has one overshot the other or?
Link Posted: 11/5/2009 3:57:40 PM EST
Reading these debates is always humorous. They're both fine inside, say, 400 yards. The 6.5 takes over from there.
Link Posted: 11/5/2009 3:59:40 PM EST
Originally Posted By Cold:
Originally Posted By Paveway_:
6.8 = 300m round

6.5 = 600-800m round


the 6.8 will do fine past 300 M

subsequently the 6.5 will do fine in CQB too. These tend to be some common misnomers around here.


I think what he means is the round is OPTIMIZED for those ranges.

6.8 has more take down power with it's wider diameter, which is ideal for close combat.
6.5 has a flatter trajectory.
Link Posted: 11/5/2009 4:03:22 PM EST
I would worry less about ballistic performance, for a general use upper, than I would worry about parts availability, ammunition availability, and staying power for the long term.

It's been illustrated that both of these rounds will kill quite readily, even at extended distances and with bigger than "recommended" game, like elk. So just put ballistics as a tertiary concern, and look at the items I mentioned above.
Link Posted: 11/5/2009 4:10:05 PM EST
Originally Posted By JonnyVain:
Originally Posted By Cold:
Originally Posted By Paveway_:
6.8 = 300m round

6.5 = 600-800m round


the 6.8 will do fine past 300 M

subsequently the 6.5 will do fine in CQB too. These tend to be some common misnomers around here.


I think what he means is the round is OPTIMIZED for those ranges.

6.8 has more take down power with it's wider diameter, which is ideal for close combat.
6.5 has a flatter trajectory.

Lol. People have been successfully hunting for a long time with various 6.5mm bullets, and there is a huge selection of 6.5mm bullets available. Anyways, 6.5mm to 6.8mm isn't exactly a big jump in size.
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