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Looks like this is a die designed for expanding necks - probably used the 260 Rem: https://www.lymanproducts.com/rifle-neck-expanding-m-diesI found this: https://www.ar15.com/forums/Armory/6-5-creedmoor-from-6mm-creedmoor-brass/42-494931/
Summary: first helpful post suggested case annealing, but OP didn't have one. OP later replied "To update, ran the 6mm CM brass through a 6.5mm Lyman mandrel die, which took the up to 6.5 CM with no complaints, and no split necks. Easy, and looks good."