I use 6.5 x 55 brass resized to 7.5 x 54. The case head diameter is closer to the 7.5 x 54 than a .308 is. I just lubed them up well with Lee case lube, put some lube inside the neck with a q tip, trimmed to length, loaded to moderate load and shot. Re-sized, trimmed and good to go. I use a Rock Chucker press, as I recall it took some effort.