Pass the 22 Grendel and hold the fluff.
Hint.................
A friend of mine has one of these he had custom built, I was looking at his brass and it is no neck turn 22 PPC.
Don't know why the name change
The shoulder is about .070" farther forward on the Grendel case, but they are otherwise very similar. Note that the chambers (particularly the neck and throat) are pretty different between a PPC and Grendel, but the case itself is pretty similar as you noticed. You can use PPC dies for Grendel cases, I do that for 243 LBC, which is a 6mm Grendel variant and basically a slightly longer 6mm PPC that's throated for heavy bullets with a no turn neck.
Hope that clears up the differences.
