Shot some 300 WSM with 180 E-tips and Reloader-19. 24" Camo Ultimate Shadow Stainless Winchester model 70.

Federal 210 Match Primers and Winchester cases.

65----2848, 2875
65.5--2870, 2858
66----2895, 2915
66.5--2903, 2910, 2921
67----2953, 2932, 2959
68----2946,2984
68.5--2952

Looks like 66 or 66.5 is the place to be. Non of the cases were sticky to eject but the 68+ had noticable jumps in recoil and the base of the cases had shiny spots with dimples on the primers.

The 65 to 67s seemed to shoot nice though I shot these today at an anatomical deer target and put all the shots in the heart from kneeling at 100's through the chrony.

I load 67gr RE19 and 180NBTs, no complaints so far.

I just did up a batch of 180 E-tips at 66 and I expect it will be a great hunting load.