Quote:
Originally Posted by NoSecondBest
There are some powders that require a crimp to burn efficiently. WW296 immediately comes to mind..
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^^^This. IMR4227 is another powder that likes a firm crimp for consistent ignition.
From the Speer reloading manual from the "reloading handgun Cartridges" section....
Quote:
When using slow burning propellants, a heavy crimp helps insure that the propellant ignites completely, acheiving higher velocities and cleaner burning".
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