I just got 50 300 blackouts loaded with those new 220gr Hornady ELDs. 10.9grs of AA1680 with a COL of 2.260". They fit the mag and the chamber with no problems. If they shoot good (no reason they shouldn't) they're going to be my go to sub bullets. I didn't think there was any VLD bullets in 220grs that would fit in the mag but these do. Wu Hu!