Just 2 3/4" 4 shot loads. Nothing particularly heavy. It'll starting seeing slugs come 3-gun season.
The thing about the video, is that I'm not sure I did that the first time. I'm thinking I just closed the bolt from the locked open position. So this should go away once it's broken in? I've only put probably 3 or 4 boxes of 8 shot and a box of 4 shot through it.