I saw this today, but I could not find what I thought I remembered on stacked pellets in shotshells in another post.
The company located in Mount Pleasant, South Carolina, and their ad blurbs state defense sector and defense industry several times on their web pages. Not being a waterfowler, I have no skin in this game, buy the stacked pellets are cool.
“Based out of South Carolina, Migra Ammunitions is at the forefront of shotgun shell innovation. Drawing from proprietary technology from the defense sector, Migra Ammunitions manufactures shotgun shells with quality and value in mind.”