It shouldn't be that hard to neck down 6.5 Grendal brass to 6 mm.
you could accomplish that with a Hornady 6mm Neck sizer die, which would cost ya only $20 or so.
Use the Grendal die as a body die, and the Hornady Neck Sizer.. I'd bet the seating die on the 6.5 would work on a 6mm Cartridge/ARC. Have to try it tho, to test if there is any run out to be concerned about.
But that is why many of us are reloaders....figure out problems on the cheap... at least some of us...
easy to find if it works or not.
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