I managed to get to the range yesterday and did some testing on three brands of 00 Buck that I had on hand. Below are the results. Please pardon my shooting as these were, literally, the first nine rounds I put through this gun. In addition to figuring out the pattern of the rounds I was also figuring out the gun's POA/POI characteristics. Conditions: Temperature: 81F Wind: 10-15 MPH Humidity: 38% Gun: Mossberg 500, 18.5" barrel, cylinder bore, bead sight Brands Tested: Rio Royal Buck 12 Ga. 2 3/4" 1345 FPS 9 Pellets Federal Power Shok 12 Ga. 2 3/4" 1290 FPS 12 Pellets Federal Premium Personal Defense with FliteControl 12 Ga. 2 3/4" 1145 FPS 9 Pellets 7 Yard Results Federal Premium, FliteControl Notes: The hole approximately 2" above and 1/2" to the left of the red dot is the pattern created at this range. The second hole, approximately 3" to the right and 3" above the red dot, is a hole created by the Power Shok's wad. Federal Power Shok Notes: While the entire pattern is a tad high (me getting used to my 'new' 500) the pattern is reasonable for 7 yards approximately 4" in diameter. Rio Royal Buck Notes: For a "cheap" round, the Royal Buck holds together pretty well at 7 yards producing a pattern perhaps even a bit better than the Power Shok about 3" in diameter. 10 Yard Results Federal Premium, FliteControl Notes: Again, the FliteControl round produces essentially a single hole. Federal Power Shok Notes: While we still have a nice collection of pellets on or near the red dot, other pellets are starting to spread with one off the grid. This gives us a pattern diameter of approximately 5" with a definite tendency of the errant rounds to stray up and left. Rio Royal Buck Notes: With its 12 pellet load, the Royal Buck delivers a tight cluster of about six pellets at 10 yards but begins to spread the remainder of the pellets considerably. The spread literally covers the entire target with a definite downward pattern.