Your start crimp dictates how much material [ shell ] there is for the final crimp. If there is very little start crimp most the time you'll end up with a hole in the final crimp. At the other end, if there's a lot of start crimp [ shell almost touching ] , then you might have too much material and get a swirl in the final crimp. I usually start with enough start crimp that a lead pencil will almost fit in the end. The plunger in the final crimp station is then adjusted to get about .060 depth [ look at a factory shell ]. Then you may have to readjust the start crimp to eliminate holes or swirls. That should get you to the step to adjust the cam/roller for a rounded, nice looking, working shell.
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Paul Harm
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Threaded Mode