That sure doesn't sound even close to Kosher to me. I'm no big fan of Savage guns, personally, but this new M220 is supposed to be something special. If I owned a M1100 with rifled barrel that shot that bad, I'd be pi$$ed! It sound to me like there is something serious wrong there. What kind of scope, bases and rings are you using? Could it be a bad scope? Do you have another you can throw on there and even just shoot one 50 yd group with, just to compare?

As I already said, I'm not a big Savage fan, nor one of this particular writer. But here's his review for what it's worth and his Savage sure seems to be doing a lot better group-wise.

http://www.chuckhawks.com/savage_slug_gun.htm

I haven't shot a slug in a shotgun in over 50yrs. But that really doesn sound all that bad to me. Remember your shooting a shotgun and pretty much at the range limit I would think anyway. If you could shoot a 4" group at 400yds with your rifle you'd be pretty happy I'd think. Of course effective range get farther than that with a rifle. Then too, you probably have some special use in mind for the shotgun otherwise you'd just use a rifle, right? I assume that it has a rifled barrel? Keep in mind that a 1 oz 20ga slud isn't that long or streamlined. Closer to shooting a round ball than a rifle bullet.