I picked up an old Lyman ST turret press along with some other stuff in a box. I got this stuff at a flea market last summer. Anyhow, buried in the bottom of the box was an old Lyman 2 chamber mold. The only markings on it are Lyman 507. I'm not sure what caliber this is. It appears to be around .30 cal. but I'm not certain. I haven't cast anything it it yet to mic. Since its steel I'll have to polish it up a bit. Any ideas? Thanks!