I like to start into the lands abou.010 then you only have one way to go. Next time you have a smith chamber a gun have him run the reamer into the chunk of barrel he cuts off about 3/4 to 7/8 of the way down the shoulder and you can use it as a gauge to measure your headspace to set up your dies and you can also use it to put a loaded round into and feel when your touching the lands.
