The 7mm STW's factory ballistics have never been reduced, because they were developed AFTER the change to electronic testting. But you may be remembering when the 7mm was a wildcat, and many people (Including Layne Simpson) were reporting muzzle velocities close to 3700 fps with 140's and 3500 with 160's. But when Remington pressure-tested those loads, they were way over the long-time SAAMI maximum of 65,000 PSI for ANY cartridge. In fact most were 70,000-75,000 PSI. Whether that is a safe pressure level is another question--but SAAMi prefers to stay on the safe side, so the factory-standard velocities were reduced.
Approximately what chamber pressure flattens Federal 215 primers?
