It all depends on where a bouts on the river you are hunting, in terms of killing mallards. First week of the season last year thats all we shot. Back waters are where you get your green heads. If you want to shoot a good pinner, go to Louisiana. The pintail migration is hit and miss around the central part of the Mississippi flyway, and they are extremely difficult to decoy at times as well, and most are not in their full plumage with big sprigs. We got into a decent pintail shoot early in the season last year over flooded corn and took a few nice drakes, none with sprigs however. Of all my years hunting I have only shot one good bull sprig in IL and that was mid december, and it was one of the few pintails we saw that day, and he came in with a group of mallards.