The shot is on a Harbor Freight moving blanket, $7 as I remember. Not my idea, read it in a post here years ago, and it works perfectly. Dump the shot in a pile and spread it by hand. Too easy picking the shot up, just pick up the edge of the blanket to form a pile and scoop it up. Never lost any shot doing this.
There bricks around the edges of the blanket because the Texas breeze was @ 30 MPH that day as I recall.