Youper...your only bout 90 miles away.
Any reason for the velocity range in the three rifles? Maybe cause the military guns have been shot a bit?
I pulled the pressure point out of my Rem stock..and glass bedded..helped with accuracy.
My load with 4064 is used with the 185 Rem bullet. I found TAC powder to give excellent results with 150`s both accurate and close to 3k MV. I went over published Max load with the TAC. No problems in the Remington rifle. No doubt these Max loadings are held in check because of the bore size difference in older military arms.