Crimping for 44mag single shot?

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light crimp for faster burning powders, heavy crimp for slower burning powders.

I have noticed unburned powder in the cases of IMR4227 when I didn't have a firm crimp.

That... and that...

Even with powders as 'fast' as Unique, I've used a taper crimp in lieu of a roller, but beyond that, or with heavy charges of Unique, I mash that roll crimp in.
 
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