From the guys who created the Tiger Bass – The coppernose bluegill grow faster and eat pelleted feed more readily than the common bluegill. With proper management and stocking, it is possible for them to reach sizes in excess of 2 pounds.

From the largest Fisheries Mgt group in the SE :When put on an intensive supplemental feeding program, coppernose bluegill commonly grow faster and larger than native bluegill in small impoundments. This is partly due to their aggressive feeding behavior.

From - Performance Comparison between Coppernose and Native Texas Bluegill Populations by Prentice and Schlechete ( a peer reviewed scientific study)

Coppernose bluegill were significantly larger than the 2 Texas types (regular bluegill and west Texas bluegill ) in all scenarios tested.
They also cite evidence of the same results in So Cal waters.