I Guess I'm WRONG, but I Might Be Kinda Right...
I was just reminded by someone that a heavy roll crimp IS necessary with heavy magnum handloads. The bullets may or may not back out of the cases under recoil with a light or no crimp, but if you are using powders like W296, the heavy crimp aids in complete powder ignition. That is not to say that the crimp alone holds the bullet in place. It is obvious that a properly resized case is essential.
BUT...when lever action rifles chambered for black powder revolver cartridges came on the scene, it seems obvious that a roll crimp became necessary---not to aid ignition, because that is not an issue with black powder---but rather to keep bullets from being pushed deeper into their cases in tubular magazines.
Still just a theory, and I could be wrong. But it makes sense to me.
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