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6 posts · Joined 2003. #1 · Feb 6, 2004. Attached is a G1 external ballistics comparison for the 6.5 Grendel, 6.8 SPC, 7.62 NATO and 5.56 NATO from 0 - 1,000 yards. All calculations where done using published ballistics coefficients for each bullet with velocity from 24 inch barrels. The 6.5 Grendel velocities are as measured fired from an AR15.
5.56 NATO – 7.62 NATO – 6.8 SPC – 6.5 GRENDEL. -122.8025.17 1612 710 -176.1047.57 1499 614 -242.7962.34 1395 531 -242.7979.68All calculations are based. on 24-inch barrels using advertised ballistic coefficients using a G1 drag profile.C. nditions are 70 degrees and 50% humid.
If you really want to talk ballistics and punching paper at distance look at the WSSM cartridges on the AR platforms. The .25 WSSM blows the 6.5 Grendel, 6.8 SPC, 7.62x39, and .223 away on velocity, range, and energy. I take nothing from any of the above mentioned rounds and in fact seriously considered both the Grendel and the 6.8.
I’m partial to 6.8spc. But 6.5 grendel and it don’t have a lot of difference in useful range and ballistics..300blackout is fun with a suppressor. If you don’t have a can, I’d roll with the 6.8 or 6.5. If money is no object. The LWRC Six8-A5 rifle is the best money can buy.
I would not take a Grendel out looking for Grizzles though, and I consider it a feature, not a bug that the 6.5 Grendel is not a long-range hunting cartridge, but is only useful at responsible and sportsmanlike hunting ranges. (100-300 yards) In other words, the 6.5 Grendel used intelligently is an excellent hunting cartridge.
Then they decided on what calibers delivered that number at "normal" hunting distances at the time by looking at ballistics charts of all the hunting calibers out there. Throwing out some calibers like 22's because they all decided that it wouldnt produce enough of a wound channel to be "ethical".
As Jack said, jump to Hornady's page and you can see the ballistics laid out. What it really is meant for, and why the DoD purchased a bunch, if for the AR-15 platform. In that OAL setting, with downrange energy and barrier concerns; it's a huge upgrade. In terms of a DMR rifle, it's far smaller and lighter than an AR-10. Worlds better?
In a short barrel rifle 6.8 wins every time... in 16"-18" barrels if you run modern loading in each cartridge, that's a 6.8spc2 load and a Grendel 2 load (there was a Grendel 1 and a grendel2 chamber) the ballistics are not much different till you get out there to around 400-500 yards.
My intent is to use the powder in a recently purchased 6.5 Grendel chambered AR type rifle. General Dynamics shows this powder made for 5.56 Frangilbe rounds with a 55.0gr projectile achieving 3165 ft/s at 51,000psi. No load was specified. This is a very fine ball powder.
The Grendel also has much weaker brass and a larger case head. 6.5 Grendel only starts to pull ahead in external ballistics anywhere from 450-800 yards depending on which 6.8spc load your using. Which is beyond the range of terminal effectiveness of any intermediate cartridge.