Free: Contests & Raffles.
That's a real mild load (WSM?) I think you'd have a real hard time hitting pressure with a lightweight Barnes and that charge.
Stein - 0.003 is a pretty small increment to work with, let alone maintain on a reliable/repeatable basis. I suggest working with a minimal increment of 0.010 when testing seating depth sensitivity.
I go .010 to .035 in .005 steps. If nothing good use .060, .090, .0120 to see if close then refine .005 steps.