BS<--------- Winchester part golds do shoot good. that is what is used in my son's 20ga tracker with a peep sight on it, but at 200 yrds i dont care about the 900lbs of energy, it will be about in the dirt. i played around at 150, and the old hood of a car, and my bench, and i found them a foot or so low at that point, now i dont have a scope, and i am sighted at 100, but if i lost close to a foot at 150, then it would seem that at 200, they would be about in the dirt. i had to use the hood to make sure i could sight in the right place with the peep sight, but by the sound of the hilly, woody, close range area you will be hunting, then by all means that 20ga slugger will work great. as far as the fields go, i would take a longer range rifle if i was you, but only my two cents.