Seeing as how the 6.5 Grendel is Medium to Long Range and 300 Blackout is about 300 yds max.

Anybody in here put a 6.5 Grendel on their AR. I have seen that people say it works best with a steel magazine instead of this new polymer magazines. Less trouble feeding them.

Has anyone in here run into that with the 300 Blackout with feeding problems due to the magazine.