This part of the post explains why they stopped using the Blazer ammo.
When my R9 was returned to the factory to correct firing pin light taps and FTF, I spoke to Karl Rohrbaugh and he was not surprised at how well the CCI ammo worked in my R9. Earlier on, Karl used CCI ammo for factory testing with positive results. [COLOR="Red"]However, Blazer using aluminum casings, could not be used for certain states requiring a spent brass sample supplied with the handgun. Thus explaining the change to Winchester 115g defense JHP
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John