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New Contest Starting Now! This Target Haunts Me
Tell us about the one that got away, the flier that ruined your group, the zero that drifted, the shot you still see when you close your eyes. Winner will receive a free scope!
Because you don’t understand what you are measuring. I suspect you are trying to describe a muzzle velocity, but the words you use relate to chamber pressure.
2900psi wont send the projectile terribly well at all, any decent powder load is likely going to generate more than 55000psi.
instead of asking why you cannot reach 2900psi, why not describe in detail what you have done and how you measured the results.