I can keep the latest range report short. I decided to try different seating depths than the .025" off the lands that was getting me good consistent 3/4 MOA-ish groups at over 3000 FPS in the .257 Roberts, with 50.8gr/Magnum. I tried .005", .025", and .050" off the lands. Guess what shot best - yep, the same .025" off I have been using since I started messing with these bullets and Magnum in the .257R. This week's group was the best yet.
I think I may be done with this load development effort.

Cheers,
Rex