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1) I believe the reason for the taper crimp die has to do with people loading plated bullets that don't have a crimp groove.
2) I do not agree that you can eliminate all crimp on .38 Special wadcutter target rounds. Lots of tests have shown that some crimp is required for uniform ignition, and a big effect accuracy.
3) I do not have test results for this, but I suspect there will be little, if any, difference in case life vis-a-vis neck splits between roll crimps and taper crimps when using slugs that have crimp grooves.
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