i have an upcoming job in 4340-m i am having problems tracking down cold drawn or ground stock

one supplier has the stock in hot rolled and turned condition but i've never ran this before and am woried about it jamming in the gb

stock dia .750 and ive got +-.002 tolerances on this side of the part

machine is a tsugami ss32 with a std- td32 guide bushing

all else fails i'll send the bar out for grinding and run it that way