I am wanting to build a 6mm grendel bolt gun but i am pulling hair trying to get info on reamer, die's . i can't get a reamer until i get lapua 6.5 grendel brass necked down to 6mm. Then take measurements to get the reamer made. Tried to call that 6mmAR guy Whitley he doesn't answer or return messages. Other's have said use a 6ppc die to neck it down but l don't know if that would neck it down too much. Then i thought use a grendel bushing neck die but i don't know if that will size the neck all the way down to the shoulder ? If i could get one of those Whitley die's I'd be in business.