The bullet was not designed nor intended to be "Crimped" in a conventional sense. It was designed to run in fairly Low Velocity loadings such as 45 ACP. As such it was intended to be loaded with an ACP Esque Taper Crimp.
In a 45 Colt case you will be ahead to adjust and use a 45ACP Taper Crimp Die with a fairly fast burn powder. The bullet was intended to be Taper Crimped just at the roll over to the Ogive. The KEY thought for OAL is this . . . Does the round "fit" where it's suppose to go. If it fits, you're good.
A CAVEAT: With a taper crimp your good as long as you don't intend to run the rounds is Tube Magazine. With other than a crimp groove and good crimp, you will experience Turtles. Turtles will jam the rifle. Also, remember that "fit" is included with the bullet having been seated where it's suppose to be seated.
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