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I recently purchased the 'standard' RCBS FL sizing die and loaded 100 .223 rounds using brass fired from _my_ Stag Arms Model 2. These rounds will not chamber in my Stag Arms AR. I subsequently measured and compared the rounds I reloaded to my 'normal' PPU 5.56 rounds and I found that the rounds I reloaded are within the SAAMI specs, but the factory PPU rounds are well under SAAMI spec in regard to case and neck diameter. I'm now trying to find/order a small/AR sizing die.
YMMV.
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