My Grade 3 10 gauge lifter factory letter states that my gun will put 480 #8 pellets in a 24" circle at 45 yards! Havn't verified that on paper yet but it kills or breaks everything I point at! I regularly break 25 straight on the skeet course with this gun by using Gauge Mate 12 gauge inserts. I can shoot off the shelf 1 1/8 oz loads with no problem. I probably have well over 3000 rounds thru this gun and it is still tight as a tick.
Cheers!