I don't keep up with these 6mm AR cartridges much. Which ones support mag-length loading of 105+gr bullets?
Pretty much all of the Grendel-based 6mm wildcats (including the 6mm ARC) do that. Almost none of the 6.8 SPC-based or 5.56-based wildcats do. That's the entire reason the Grendel case is popular for these cartridges - to fit long heavy bullets at mag length.
In my 243 LBC barrels (one of the most successful Grendel-based 6mm wildcats) my accuracy loads for the 105gr BTHP and for the 95gr VLD which actually has a longer nose are both less than 2.260" OAL, even though 2.300" or slightly longer is possible with ASC mags. This is one of the few AR cartridges I've used where magazine length is not a restriction on potential accuracy due to jump to the lands.
