I have tested a variety of loads with crimp and no crimp. In most rifles, I haven't found it to make any difference. To prevent bullets moving under recoil I have to crimp 378 and 460 Weatherby and 458 Lott.
Go to accuratereloading.com, then to reloading pages then to the FAQ link at the bottom of the page. There is a discussion about this; the tester found a 10% improvement with crimped ammo.
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