Re: retumbo powder......pressure signs
I was shooting 93 gr of Retumbo with the 168 Berger in my 7 RUM, 215's with a 32.5" bbl. Killer accuracy, killer velocity, 3580 fps, and also killer on the cases. Only get one or two reloads before the primer pocket opend up. Every once in a while I would blow them up on the way down range.
One day I walked it down to 85.0 gr in one grain increments to see where accuracy and velocity fell off. I ended up with 85.0 gr at 3300fps with the same killer accuracy, and an ES of 15 fps. Cases now survive about five or six reloads. You may have a tight barrel. Try doing what I did, you may find that comfortable load on the bottom.
"Character is who you are when nobody is watching"