According to Forster, the "S" (Standard) Shell Holder Jaws are for the 6.5 Grendel (same head/rim size as the 6 ARC). The table on page 2 says to use the small end of the shell holder. Looking at the dimensions of the rim diameter (~.440") of the 6 ARC & Grendel cases (7.62x39 too), I don't see how that's possible. I'm wondering, what are the measurements of the jaw openings? Are they the max/min rim diameters of the cases they're intended to hold or are they the case extractor groove diameters (~.370")? If the dimensions are extractor groove diameters, they could work for 6 ARC but with the small end of the "LS" jaws.
https://www.forsterproducts.com/pdf/cata..._19-22.pdf
You'll probably have to use the shell holder adapter...![[Image: rolleyes.png]](https://6mmarc.com/images/smilies/rolleyes.png)
https://www.forsterproducts.com/pdf/cata..._19-22.pdf
You'll probably have to use the shell holder adapter...
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