Just looking at the 6.5 Grendel, pretty good results, and proper test results from 50 or 100 yards and protocols on Wikipedia.. this is a first.
"Alexander Arms contracted Speer Law Enforcement to perform terminal ballistics tests in accordance with standard F.B.I. Protocols and their standard in-house procedures. They use 6 in × 6 in × 16 in (150 mm × 150 mm × 400 mm) blocks of ten percent ballistic gelatin, calibrated with a BB. These results were made public in May 2006. All tests were completed using either 14.5- or 16.0-inch (370 or 400 mm) chrome-lined Alexander Arms Tactical rifles and shot from either 50 or 100 yards (45 or 90 m) to simulate combat conditions using short-barreled M4 format weapons. Barrel pressures were less than 345 MPa (50,000 psi). These are all production rifles and ammunition except for the prototype 123 gr (8.0 g) Sierra MatchKing (now a production bullet). In addition to the photos shown below, a 90 gr (5.8 g) TNT was tested resulting in explosive fragmentation after penetrating only 0.5 in (13 mm).
The 120-grain (7.8 g) Sierra MatchKing penetrated 3.25 inches (83 mm) before yawing and fragmenting. The Alexander Arms Tactical 16 carbine (16 in/410 mm barrel) was used at a range of 100 yards (91 m). Impact velocity: 2,383 feet per second (726 m/s). Maximum penetration of the 120 gr (7.8 g) SMK was 19.5 inches (500 mm), maximum permanent cavity diameter was more than 6 inches (150 mm) with lesions running to gel block exterior surfaces. Depth to the maximum permanent cavity was 7.5 inches (190 mm). The bullet fragmented, with seven large pieces visible within the block. Jacket sections came to rest at 11.75 and 16.25 inches (298 mm and 413 mm), and the bullet core at 19.5 inches (500 mm).
The prototype 123 gr (8.0 g) SMK penetrated 2 inches (51 mm) before yawing and fragmenting. The Alexander Arms Tactical 14.5 carbine (14.5 inches (370 mm) barrel) was used at a range of 50 yards (46 m). Impact velocity was 2,385 ft/s (727 m/s). The 123 SMK penetrated to a depth of 16.2 inches (410 mm), maximum permanent cavity diameter was more than 6 inches (150 mm) with lesions running to block exterior surfaces. Depth to the maximum permanent cavity was 7 inches (180 mm). The bullet fragmented into multiple small fragments with jacket pieces visible at 11 and 13 inches (280 and 330 mm). A small core fragment was visible at a maximum depth of 16.2 inches (410 mm).
The 120 gr (7.8 g) Norma FMJ penetrated 16.5 inches (420 mm) before veering out the side of the block and impacting the support frame. No fragmentation was evident, but the slug is believed to have tumbled at about 7 inches (180 mm) with its maximum permanent cavity at 11 inches (280 mm). Lesions of more than 6 inches (150 mm) were torn through the top and bottom block surfaces. The bullet was fired from an Alexander Arms Tactical 14.5-inch (370 mm) AR-15 rifle at a range of 50 yards (46 m) with a chronographed impact velocity of 2,405 ft/s (733 m/s)."
Even the FMJ performed well to say the least... but then again, some of these are double the weight of the 5.56.
Other than that the 6.8 SPC has no real results about yaw, fragmentation, etc but only of "energy" which only applies if you believe the "energy dump" theory - Special Operations have tested it.... on enemy combatants... and it has got some really good results, along with using multiple types of ammunition for it; some of which give greater and more immediate temporary cavity expansion, it tended to put the bad guys down. No information on Special Ops using the 6.5 Grendel but I'm sure they've tried it out at somepoint... that said, it doesn't mean it has to be tested in theatre.
Both manufacturers have changed the overall velocity of the cartridges a few times, one time it went down by a whole 100fps. How'd they get that wrong?
Anyways, both these ammunition types are lighter than the 7.62 NATO, give good accuracy and give great wound ballistics. I noticed they are trying to play the card of getting rid of the 7.62 for this round on Wikipedia; nothing's wrong with 7.62.