I have run the 7x57 with 139-140's at 3000 fps and 160's at 2800 fps in a long throated Ruger. I have a pressure trace and had used these loads for probably 20 years here in 100 degree weather before I tested them. They show 64000 psi, case life is almost forever, but it is a warm load only used in Win. cases and in a long throated rifle. There is probably no difference in effective case capacity between a long throated 7x57 and a short throated .280. That said, I have also had 7x57's that would show 200 fps more velocity than this one with the same loads. That is the reason for the wide variation in loads for this caliber.
