What would cause this?
Reloading for 22-250 ruger, used winchester, remington, and federal brass. Win LR primers, IMR-3031 powder, and winchester 55gr PSP.
Working up loads for each brass type was 5 each 31gr. 31.5gr 32gr, and 32.5 gr.
Winchester grouped best at 32.5gr with .60" group, remington...