Tried out some .221 Fireball loads in my XP-100 over the chronograph. Alliant shows a load of 15.5 grains of 2400 at 2700 fps from the 10.75" barrel. My loads of 15.5 grains of 2400 (individually weighed) are averaging 3033 fps for eight rounds with 40 grain V-Max. Fastest was 3066 fps. I have no pressure signs. Bolt is not sticky, easy extraction and primers look fine. Very small amount of soot on some of the case mouths. The powder is from a "new" can, meaning unopened, that had been sitting in my dad's reloading room for about 12-15 years. Advice? Should I back off based on velocity alone or continue to monitor the pressure signs. I know none are an exact indicator.