The contender has been around a while and has had some features updating it to the G2? model.....Anyhoo the Encore was designed with a thicker, stronger receiver, to handle higher pressure, more powerful cartridges like the .308/.30-06/up tp .357H&H Class, and up to 12ga shotgun. The Contender will only handle big calibers at low pressure, or smaller calibers at higher pressure...like 45/70, .410, and .223, but not .270, , etc....for higher pressure cartridges and the larger shotgun bores, you have to go to the Encore. Both will do rimfire.
Here's a thought: Let the ducks work and decoy.