Like Bill said, the bullet has nothing to do with setting the headspace. The headspace is set off the shoulder of the case. Use gauges if you've got them but
if you don't have gauges, use a "full length sized case". My gauges get used by other folks more than me.
When I use them,(gauges) I set the headspace then go back and reset to the sized case. My rigs wouldn't chamber a factory loaded round because the headspace is set pretty tight. Tight headspace = less brass movement and longer brass life. Shoulder bump and neck size. (throw in a body size when needed if the case gets snug in the chamber)