Exchange the 260 brass and dies for 6.5x55 brass and dies.
Lapua makes 6.5x55 brass. Would be a better fit n the M70.
Go light contour, you may love it so much you want to carry it in the field?
Heavy contours suck for hunting.
If you know it will never leave the bench then go heavy.
Easier to spot your shots at long range etc...
Have a hard time wrapping my mind around a pr-64 M70 in a bench gun, but it's your money and your rifles so by all means do what pleases you.
As to the 6.5x47 it may cause feed issues? Hate to see you alter your M70 to make it work?
