I have a remmington 700 300 win mag ps bbl 26inch. I am trying to figure out a good bullet seating depth, I am using sierra 190 gr bthp and using H4831 powder at 69gr. I have been told to seat the bullet as long as my DM would allow and the bolt would close on. That is quite a bit longer than the 3.340 in the sierra reloading book. Was concerned about pressure buildup,but not sure how low to go with starting load. Thanks in advance for your help.