If you are getting close to predictable velocities per load I doubt it is leaking
You would think your gun would be noticeably dirtier as well.
Every open gun I have seen run has plenty of flame if loaded to PF.
I have to flare my 40 brass slightly to stop the projectiles falling off the press when it indexes.
I don't crimp any ammunition I load. Never have.
Even my revolver ammo shoots as well as can be expected.
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