Thread: 6.5 x 55 Arch Improved Load Data

Depending on the projectile weight you are using IMR4350 and IMR4831 should work well if you can get any. I would not trust any old data as the pressures may be stratospheric. Data for the parent 6.5x55 is all over the map so estimating likely velocities in the Ackley would be tricky. Let me know if you need some suggestions on this.
GPM.