I've noticed 6.5 Grendel and the 6.8 Remington SPC both appear to be an unique case. Are they each one off or is there a parent case each used?

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This may help

6.5mm Grendel - Wikipedia, the free encyclopedia

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Correct,
The Grendel is an off-shoot of the PPC family. The 6.8 is a offspring of the .30 Remington Case.

The 6.5 Grendel's parent cartridge is the PPC case. 6.8 SPC's parent cartridge is the .30 Remington.

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The 6.8 is an offshoot of the .30 Remington, and the 6.5 Grendel is from a PPC but can also be made from reformed 7.62 x 39, which is one reason why Wolf jumped on board with their Grendel line. All they needed was a final form instead of having to produce a entirely new blank to form from. In fact, I and about a zillion other people have made their own Grendel cases out of WW 7.62 x 39 brass cases before they were widely produced by Lapua and Hornady.

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Huh.....did I hear that somewhere before?.........LOL

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Yes you did, but you did not mention that the Grendel can be made from 7.62 x 39 cases. A whole lot of people use to shy off the Grendel when they thought they had to buy the expensive and hard to find AA, Lapua, or PPC brass to get Grendel cases. By running the 7.62 x 39 in the sizing die out comes Grendel with just a little more body taper. After the first shot they are fire-formed perfectly. From what I have been told you do not even loose much if any fps when shooting them the first time to form and the second time for load work up. I would not used un-fire-formed cases for load work up though. It is fine at the start but it could give a false reading at the high end.

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