From Outdoor Life Regarding Powders Faster:Changes to the powder-grain geometry allow Superformance powders to generate up to 200 fps of additional velocity while maintaining safe pressures. More Accurate: No matter whether the thermometer reads -40 or 165 degree F--a remarkable temperature range-IMR8208XBR will deliver cosistent performance with excellent accuracy:IMR 8208 Test Results:175-grain .308 Win --20 degrees F / 2,585 fps / 55,900 psi. 165 degrees F /2,597 fps / 56,000 psi. Cleaner: An ingredient in CFE223 removes copper fouling from your barrel as it follows the bullet down the bore,making it ideal for shooting where a high round count can degrade accuracy and performance. We can't change the laws of physics,says Hodgon but we can bend them.If we learn to control the pressures better,there's no limit.FYI.