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In my experience the purpose of a crimp is to keep the bullet in place up until you cause it to move by pulling the trigger. With that in mind you can apply that thinking to the various action types and effects of recoil on rounds kepted in a magizine, tube or cylinder. I never crimp rifle unless its auto loading. I crimp all pistol stuff to keep bullets from moving on recoil. A pistol cartridge fired from a single shot pistol like a contender needs no crimp. And last: I learned a lot about picking the best powder for pistol by shooting zero crimp loads from a contender. Its my opinion that a crimp is the most un-repetable process in reloading and finding a powder, bullet and primer that works without the need for a crimp leads to better loads, less deviation and better accuracy.
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