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Your crimp is gone as soon as the primer goes off. There is enough impulse pressure at that nano second to push the bullet into the rifling before the powder fully ignites. (A hotly debated topic in some places but I believe it's true. Ever have a round go off where the primer went off and the powder didn't ignite? I've seen it and the bullet ended up three inches inside the barrel). I've tried crimping vs no crimp and haven't seen a difference in grouping. Consistant neck tension is important.
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