Silver State Arms makes brass in both LR and SR primers. I do believe that all of their loaded ammo is built using Small Rifle primers. Hornady also make brass and loaded ammunition in SR primers as well.
Your chart is a mite bit conservative.
I have personally shot 100 grain bullets at 2998 fps that I have handloaded and no pressure signs. I have recently shot some 110 grain Sierra Spitzers at 2780 average fps muzzle velocity, and with accuracy at around 3/4 " at 100 yards.
Their are bullets in the 85 range that go well over 3100 fps. This would make a bit different kinetic energy.
You might have gotten that chart from frfrogpad website with the following info:
There are currently 4 known military variations in use or in test: according to some sources a "ball" projectile of open tip match construction with either 110 gr or 115 gr projectile, a tracer, a 97 gr AP round, and supposedly a blank round. The 97 gr AP round utilizes a solid copper bullet with bands cut around the outside and a hardened steel or tungsten penetrator inserted into the bullet. No designations are known at this time. The cartridge has performed well in barrels down to 10" and shorter. Typical velocities for the SSA 115 gr commercial load are given below.
Barrel Velocity Change
Sorty that it scattered it around. These were from early "commercial" loads and they had to keep down the pressures as there were still rifles out there with the earlier and WRONG SAAMI chamber with the tight throat leade cut in the neck of the chamber. Recent changes in reamer design made it possible to boost the powder and performance of the 6.8 SPC with a newer designation of 6.8 X 43 or 6.8 SPC II chamber. Relaxed rifling in 1 in 10.5, 1in 11, 1 in 11.12, 1 in 12 and 1 in13 also contributed to lower chamber pressures to drive the bullet faster. 1:10, 1:11 and 1:12 are somewhat more common, but the others are a bit harder to find. Also the 1:13 does not do as well at stabilizing the longer 130 gr bullets as a 1:12 twist does.
Here is a link to the frog pad's info: The 6
This piece by HTR (Hi Tech Rancher) a very avid 6.8 SPC II shooter gives a lot of insight on what has been happening to the cartridge of recent. Today's State of the Art in 6.8 X 43 mm SPC - Sniper's Hide Forums
One of the greatest reasons the 6.8 SPC shines is that when shooting in the shorter barrel M4 carbine, it does not give up as much energy as the 5.56 does. this is because of the cartridge and bullet being larger in diameter and the ratio makes it so that even in a 16" barrel it is near it's upper velocity and going to long, and bulkier to carry barrels of 20 -24" does not give you that much extra velocity.
Personal Taurus Pistol site with info and pictures and links.
Taurus Millennium PRO in .45 ACP, Bersa Thunder 380, SIG Sauer SP2022 in 9mm
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