I've had this happen before. If I understand correctly, the round is going part way in, then the bolt rides over the rear of the cartridge, then you retract the bolt and cycle it again which finishes chambering the round? If so, try opening up the feed lips on the magazine very slightly. Even biasing the rear of the lips slightly more than the front. It will allow the cartridge in the magazine to rise to a slightly higher position and keep the rear end from diving under the bolt as its pushed forward. Good luck!
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