I modified my Vixen to suit the later S491 mag box which was made for the PPC. As Rupert said a standard 222-223 vixen wont feed the fat PPC case. Mine works ok in the modded form as the Grendel is loaded to near full length of the mag. Your mag spring could be too weak if theres not enough pressure to push case up against feed rails to keep it square, just a thought?
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