From what I can gather in bits and pieces between threads, magnum primers kick up bullet speed 50-100fps. It ignites the powder mass near concurrent manner vs regular CCI 300 primer. I need to know if magnum primers RAISES pressure inside barrel. Does it? How significant? Specific case: 180gr XTP or Nosler, new cases, 9.30 +/- .05 gr of LongShot, 6" KKM barrel. Expecting near 1,400fps... If you could spend a few minutes on your experience with Magnum 350 vs regular 300 CCI primer, please do. Thanks in advance! Pressure is a direct function of powder mass. But isn't the 350 really accelerate burn rate? Once the bullet is some distance down the barrel, pressure is really independent of primer type? Because powder mass is the same?