11-17-2014, 12:05 AM
LRRPF52 Wrote:...For a 22" AR15, I would not mass produce a load over 32.2gr of CFE under a 123gr, given that 31.7gr is the max under a 129gr. Even there, you have speeds that are around 2700fps, which is plenty fast. CFE223 has proven to be a very forgiving powder for me, creeps up predictably, no surprises, no spikes, just a nice gradual velocity increase that behaves well with the case capacity of the Grendel...
Usually I load 8208XBR, but this testimonial prompted me to load some CFE223 charges under some 123gn SMKs. 31.2, 31.3, 31.4, and 31.5gn all obtained nearly identical velocities of ~2525fps out of a 20". Apparently reaching a plateau. I infer I should not step to any higher charges.