"As regards to the .270, I'm 99% sure its the load, all components were the same except it was a new batch of powder, H4831. The scope, base and rings have all been replaced since I loaded that batch of 100 and accuracy is still not on par of what it use to be."
That statement shows that you now have two new varibles in the .270 to contend with. A different lot of powder and a new scope, base and rings. However, going from a 7/8" group to a 1 3/8" group sounds like an issue related to the change in powder lots.
I think you're right on track with thinking it's the load.
fish head
