I loaded up some 300 wsm in 165 grain sierra hpbt gamkings and was not able to chrono because battery was dead but did get max load info based on bolt lift and primer crater. Here's the data..
66 gr. R-17 no stiffness in bolt and primer looks great
67 gr. R-17 tiny bit of bolt stiffness but no primer crater
67.5 gr. R-17 little stiffer bolt, slight cratering of primer
68 gr. R-17 significanly stiff bolt lift, clear cratering of primer. Based on this data in my kimber 8400, I would not go over 67 grains R-17 in 165 bullets. I just wish I had some chrono data.
