Unfortunately the 75 A-Max loaded to mag length in the AR isn't a good mix due to the ogive being inside the case. You will have to either single load (drop them throug the ejection port on the mag follower) or run the Sierra 77 SMK or Hornady 75gr BTHP projectiles if wanting to run them through the mag. I think AR mags are around 2.250" internally.
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