30 carb

I roll crimp mine but I use a bullet with a groove for that. I only roll crimp till it still stops at the mouth of the chambers. I get plenty of crimp to hold and not so much that it doesn't headspace...either way should work
 
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I would think since the cartridge is designed to "seat" on the case mouth and taper crimped, that firearms are designed to use the cartridge as designed, it would be best to taper crimp. The exception being guns designed to use moon clips...
 

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