Ive tried Winchester, Herters and Federal 3” 5 pellet 000 buck loads.
The federal version is copper plated buck while the others are plain lead.
They all seem to pattern quite similarly. One big hole out to about 5yds.
By 7yds the pellets start to disperse horizontally and vertically and open up into a bit more of a pattern usually no more then about 3”x3” often better.
By 10 yds the pellets start to string vertically and look a lot like the pattern I showed previously.
By 15yds the pellets usually have probounced stringing vertically. About a 6” spread up and down, maybe only a couple of inches wide.
20yds I start to have trouble keeping them all on a 8.5x11” sheet. If I’m using the load my gun likes it might manage. My M6 survival rifle likes the Winchester variety and will keep a 6” vertical spread out at 20yds. While my shockwave prefers the Federal it will spread them over most of the printer paper at 20. Every barrel is its own snowflake. I think the M6 has an edge with its full choke vs the cylinder of the Mossberg.
Stay away from the Aguila 2.5” 00 4 pellet. It wont shoot worth a damn in either of my .410s.