Fscott1520
Member
I am fixing to start working up a load for a new 300 win mag tc pro hunter with 178 gr eld bullets. My hornady oal guage says I contact the lands at 3.53 coal. Since it is a single shot and I can seat long what would be a good starting point and about how many different depths should I try to determine my ultimate depth? 3 shot groups each .01 or .02 deeper than the other. This will be a hunting rifle but I would like to get it dialed in close. Also does it matter if the brass is new or fire formed already in this first step. Also does powder choice matter during the depth seating step? Btw barrell is 28" stainless fluted. Thanks.