Best oal for 300 blk from AI mags

[LouBoyd]

Could you be specific about what AI mag you're using? Is that the 10 round polymer body mag sold by Accuracy International you're referring to?



Considering it's designed for .223Rem or 7.62x45 it would just be luck if it works with the 300 BLK cartridge which has a much shorter body. If it was a metal mag adjusting the feed lips would be the typical solution, but that's not easy to experiment with on a mag with plastic lips. I don't have an answer.