the chamber isn't that different? in that case my .308 homeloads would work in Boydy47's .308 ? even though he has pressure signs 2-3 grns before I do!
if you decided to use a high load based on Quickload you may fall foul of a tight chamber, the old way of working a load up is the way forward, the OP was trying to short circuit part of that process,
I just believe in this case that a manual is as good a way to decide on a starting point as any.
As to prescision shooting, its not for me, I shoot mainly off of sticks or a ruck, or the roof of a truck at fast moving targets after having my ribs and kidneys asaulted by the terrain! minute of rabbit works for me