Tejano,
After recently starting some historical research on the 7mm Remington Magnum, I have started to suspect that part of the reason Remington loaded the 175-grain roundnose (not "semi spitzer") Corelokt in their original 175 factory load because they had a bunch of leftovers from when they made 7x57 ammo. .
Didn't know this and I was mixing up the original 175 Nosler semi spitzer with the RN CL.. Look forward to your article. Thanks.