I may have already posted this, I forget sometimes. I've had 5, I think, .257s. A couple loads seem to pop out at the top of the list more often than not. WW +P brass, Fed 210M primers, 48 grains of H4831, and 100 grain ballistic tips. (One rifle like the same load with 100 grain partitions as well.) Remington brass, Fed 210M or 215 primers, 44 grains of IMR 4064, and 75 grain Sierra HPs. WW or Nosler +P brass, Fed 215 primers, 43 grains of H414, and 120 grain partitions. (If you have any leftover Hornady 120 grain hollow points, they've shot well in 1 gun with otherwise the same load.)
Most of my .257s have been light rifles. Kind of finicky. These loads seem to work though.
Tom
