Mossberg 500 with a 24" barrel, rifle sights, and a full choke. Ammunition is Winchester
The Mossburg 500 24" rifle sight barrels are open cylinder and NOT full choke.
Thats probally why you missed. I would use the 28 inch barrel with the screw in
modified or full choke. In my Mossburg, #1 buckshot works best in the full choke,
00 in the modified. 50 yards can be on the farside of buckshot accuracy. I would shoot the gun with different loads and chokes and let that be your guide.