Don't know about the "SA CORP", but .250 Savage was formerly known as the Savage .250 3000 (or some such arrangement of the name & numbers). This was to draw attention to the fact their cartridge sent the bullet screaming out of the barrel at a blistering 3,000 feet per second. I believe the reason we have 87 grain bullets in .257 caliber is because in order to reach the coveted 3,000 fps mark, the heaviest bullet they could use was 87 grains.