Does anyone have any load data for 7x65R? I have been trying to work up a load for mine using 173gn S&B 173gn SPCE bullets, extrapolating from .280R data as instructed by at least two of the load manuals I have. Using H4831 accuracy is excellent but velocity is at least 300FPS from where it should be, i.e. 2,200 rather than 2,400FPS).
Either the listed max' charge of 51gns is very conservative or I need a much slower powder - pressure is low and the max' H2O capacity of the S&B case is 69.4gns, albeit a lot of the capacity is taken up with the very long bullet.
Any actual 7x65R load data would be much appreciated as something isn't reading across from either 7x64 or .280R. Quickload is indicating that compressed loads are needed to match factory velocities but I'm slightly anxious about using high pressure loads in a break barrel rifle...