Jerry, I FL size, bump the shoulder .001 to .0015. I gave up on neck sizing except for new brass. I will neck size that for the 1st use about 1/2 the neck. I shoot mainly Sierra 75HP's in it. I use or have used IMR4831, IMR4064 and RL19. I have went as small as .1875 for three shot groups and it averages about 0.50 to 0.625. I have found both my Rugers like about .050 off the lands. I don't shoot the rifle that much as I have always liked my Ruger MKII 6mm best.
Good Shooting, George
Last edited by George Foster; 10-29-2019 at 05:03 AM.