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Just wondering what effect crimping has on pressure and velocity. Lets say you have a two 44 mag cartridges both with the same case, powder charge, bullet, primer. One has a mild roll crimp, and the other has a heavy roll crimp. Would the heavy crimped cartridge give you more velocity (FPS) and higher pressure?
 

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What turns the trick is bullet pull, not necessarily crimp. A crimp that is too severe will actually buckle the neck below the crimp and reduce total bullet pull.

But in general, the higher the bullet pull, the more complete the ignition and burn. That results in more pressure, more velocity and also more consistency from shot to shot.
 

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If you are using jacketed bullets, just compare yours with those. In general, you ought to be able to see just a trace of curvature right at the mouth. Your eye is a surprisingly good judge of this after a bit.

If you can spin the bullet with your fingers, you have gone way overboard.
 
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