I have a basic Moss 500. I put in Moss XX-full choke, use Nitro 4x6x7 loads. I get over 30 pellets in head & neck at 40yds. Last spring I took a nice tom at 60yds in narrow wooded lane. It was a down hill shot, and I didn't think the bird was out that far. I was stunned when my dad & I paced it out. Was one heck of a shot. My 2 boys also have Moss 500's with the Undertaker choke. They also pattern just as good. I really think the Nitro ammo is the key for a Mossberg.